🐞 Bug Report: [object Object] shown in margin text fields

### Prerequisites

- [X] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
- [X] The issue still exists against the latest stable version of Elementor.

### Description

In certain situations `[object Object]` is shown in the margin text fields

### Steps to reproduce

1. Insert a new container
2. Desktop breakpoint, set margin fields empty but change unit to edit/pencil icon
3. Change to tablet/mobile breakpoint

[Here's a screencast](https://www.dropbox.com/scl/fi/b494s52b3l3so0sa5hbdv/22470-elementor-object-in-fields.webm?rlkey=5loql3rwz72z7n0pa1d4xhhxd&st=4wgg940g&dl=0).

### Isolating the problem

- [X] This bug happens with only Elementor plugin active (and Elementor Pro).
- [X] This bug happens with a Blank WordPress theme active ([Hello theme](https://wordpress.org/themes/hello-elementor/)).
- [X] I can reproduce this bug consistently following the steps above.

### System Info

System Info

````txt

== Server Environment ==
Operating System: Linux
Software: Apache
MySQL version: MariaDB Server v10.5.16
PHP Version: 8.0.28
PHP Memory Limit: 256M
PHP Max Input Vars: 1000
PHP Max Post Size: 50M
GD Installed: Yes
ZIP Installed: Yes
Write Permissions: There are some writing permissions issues with the following directories/files:
- WordPress root directory
Elementor Library: Connected

== WordPress Environment ==
Version: 6.2
Site URL: https://example.local/wp
Home URL: https://example.local
WP Multisite: No
Max Upload Size: 40 MB
Memory limit: 40M
Max Memory limit: 256M
Permalink Structure: /news/%postname%/
Language: en-GB
Timezone: Europe/London
Admin Email: jamie@example.local
Debug Mode: Inactive

== Theme ==
Name: Hello Elementor
Version: 2.7.1
Author: Elementor Team
Child Theme: No

== User ==
Role: administrator
WP Profile lang: en_GB
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

== Active Plugins ==
Code Snippets
Version: 3.3.0
Author: Code Snippets Pro

Converter for Media
Version: 5.8.6
Author: matt plugins

Elementor
Version: 3.13.2
Author: Elementor.com

Elementor Pro
Version: 3.13.1
Author: Elementor.com

Pods - Custom Content Types and Fields
Version: 2.9.13
Author: Pods Framework Team

Rank Math SEO
Version: 1.0.114
Author: Rank Math

W3 Total Cache
Version: 2.3.2
Author: BoldGrid

Wordfence Security
Version: 7.9.2
Author: Wordfence

== Must-Use Plugins ==
Bedrock Autoloader
Version: 1.0.3
Author: Roots

Disable status tests
Version: 1.0.0
Author: Roots

Register Theme Directory
Version: 1.0.0
Author: Roots

== Features ==
Custom Fonts: 0
Custom Icons: 0

== Integrations ==

google_maps: Active

== Elementor Experiments ==
Optimised DOM Output: Active by default
Improved asset loading: Active by default
Improved CSS Loading: Active by default
Inline Font Icons: Inactive by default
Accessibility improvements: Active by default
Additional Custom Breakpoints: Active by default
admin_menu_rearrangement: Inactive by default
Flexbox Container: Active
Upgrade Swiper Library: Active by default
Grid Container: Inactive by default
Default to New Theme Builder: Active by default
Hello Theme Header & Footer: Active by default
Editor Top Bar: Inactive by default
Landing pages: Active by default
Nested Elements: Inactive by default
Lazy Load Background Images: Inactive by default
Page Transitions: Active by default
Notes: Active by default
Loop: Active by default
Form Submissions: Active by default
Scroll Snap: Active by default
Menu: Inactive by default

== Log ==

Log: showing 12 of 122023-05-15 12:11:46 [info] Elementor data updater process has been queued. [array (
'plugin' => 'Elementor',
'from' => '3.12.2',
'to' => '3.13.2',
)]
2023-05-15 12:11:46 [info] Elementor data updater process has been queued. [array (
'plugin' => 'Elementor Pro',
'from' => '3.12.3',
'to' => '3.13.1',
)]
2023-05-15 12:12:08 [info] Update DB has been started [array (
'plugin' => 'Elementor',
'from' => '3.12.2',
'to' => '3.13.2',
)]
2023-05-15 12:12:08 [info] elementor::elementor_updater Started
2023-05-15 12:12:08 [info] Elementor/Upgrades - _on_each_version Start
2023-05-15 12:12:08 [info] Elementor/Upgrades - _on_each_version Finished
2023-05-15 12:12:08 [info] Elementor data updater process has been completed. [array (
'plugin' => 'Elementor',
'from' => '3.12.2',
'to' => '3.13.2',
)]
2023-05-15 12:12:10 [info] Update DB has been started [array (
'plugin' => 'Elementor Pro',
'from' => '3.12.3',
'to' => '3.13.1',
)]
2023-05-15 12:12:10 [info] elementor-pro::elementor_pro_updater Started
2023-05-15 12:12:10 [info] Elementor Pro/Upgrades - _on_each_version Start
2023-05-15 12:12:10 [info] Elementor Pro/Upgrades - _on_each_version Finished
2023-05-15 12:12:10 [info] Elementor data updater process has been completed. [array (
'plugin' => 'Elementor Pro',
'from' => '3.12.3',
'to' => '3.13.1',
)]

PHP: showing 13 of 13PHP: 2023-05-15 13:16:06 [warning X 51][/var/www/vhosts/example.local/releases/5/web/app/plugins/elementor/core/common/modules/ajax/module.php::175] Undefined array key "data" [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-15 13:16:11 [warning X 1][/var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/import-export/runners/import/templates.php::103] Undefined array key "conditions" [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-15 13:16:59 [warning X 8][/var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php::150] Undefined array key "condition_type" [array (
'trace' => '
#0: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(150): Elementor\Core\Logger\Manager -> rest_error_handler()
#1: ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_template_json_item()
#2: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(120): class type array_map()
#3: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(59): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_templates_json()
#4: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor/data/base/endpoint.php(158): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> get_items()
',
)]
PHP: 2023-05-15 13:28:33 [warning X 43][/var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/modules/dynamic-tags/pods/tags/pods-base.php::35] Trying to access array offset on value of type null [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-15 13:32:46 [warning X 1][/var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php::150] Undefined array key "condition_type" [array (
'trace' => '
#0: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(150): Elementor\Core\Logger\Manager -> rest_error_handler()
#1: ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_template_json_item()
#2: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(120): class type array_map()
#3: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(69): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_templates_json()
#4: /var/www/vhosts/example.local/releases/5/web/app/plugins/elementor/data/base/endpoint.php(162): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> create_items()
',
)]
PHP: 2023-05-15 14:44:16 [warning X 21][/var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php::150] Undefined array key "condition_type" [array (
'trace' => '
#0: /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(150): Elementor\Core\Logger\Manager -> rest_error_handler()
#1: ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_template_json_item()
#2: /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(120): class type array_map()
#3: /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(59): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_templates_json()
#4: /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor/data/base/endpoint.php(158): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> get_items()
',
)]
PHP: 2023-05-15 14:44:56 [warning X 4][/var/www/vhosts/example.local/releases/6/web/app/plugins/elementor/includes/managers/image.php::108] Trying to access array offset on value of type bool [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-15 14:45:08 [error X 1][/var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php::304] Uncaught Error: Call to a member function update_meta() on null in /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php:304
Stack trace:
#0 /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php(177): ElementorPro\Modules\ThemeBuilder\Classes\Conditions_Manager->save_conditions(14, Array)
#1 [internal function]: ElementorPro\Modules\ThemeBuilder\Classes\Conditions_Manager->ajax_save_theme_template_conditions(Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#2 /var/www/vhosts/example.local/releases/6/web/app/plugins/elementor/core/common/modules/ajax/module.php(175): call_user_func(Array, Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#3 /var/www/vhosts/example.local/releases/6/web/wp/wp-includes/class-wp-hook.php(308): Elementor\Core\Common\Modules\Ajax\Module->handle_ajax_request('')
#4 /var/www/vhosts/example.local/releases/6/web/wp/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#5 /var/www/vhosts/example.local/releases/6/web/wp/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#6 /var/www/vhosts/example.local/releases/6/web/wp/wp-admin/admin-ajax.php(188): do_action('wp_ajax_element...')
#7 {main}
thrown [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-15 14:45:19 [warning X 2][/var/www/vhosts/example.local/releases/6/web/app/plugins/elementor/core/files/file-types/svg.php::234] simplexml_load_file(): I/O warning : failed to load external entity "https://example.local/app/uploads/2023/05/logo.svg" [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-16 11:18:55 [warning X 2][/var/www/vhosts/example.local/releases/6/web/app/plugins/elementor/core/files/file-types/svg.php::234] simplexml_load_file(): I/O warning : failed to load external entity "https://example.local/app/uploads/2023/05/page-curl.svg" [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-16 12:34:22 [warning X 21][/var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php::150] Undefined array key "condition_type" [array (
'trace' => '
#0: /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(150): Elementor\Core\Logger\Manager -> rest_error_handler()
#1: ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_template_json_item()
#2: /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(120): class type array_map()
#3: /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/core/app/modules/site-editor/data/endpoints/templates.php(59): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> normalize_templates_json()
#4: /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor/data/base/endpoint.php(158): ElementorPro\Core\App\Modules\SiteEditor\Data\Endpoints\Templates -> get_items()
',
)]
PHP: 2023-05-17 09:20:43 [warning X 2][/var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/modules/posts/skins/skin-content-base.php::265] Attempt to read property "ID" on null [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2023-05-17 09:33:23 [error X 1][/var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php::304] Uncaught Error: Call to a member function update_meta() on null in /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php:304
Stack trace:
#0 /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor-pro/modules/theme-builder/classes/conditions-manager.php(177): ElementorPro\Modules\ThemeBuilder\Classes\Conditions_Manager->save_conditions(14, Array)
#1 [internal function]: ElementorPro\Modules\ThemeBuilder\Classes\Conditions_Manager->ajax_save_theme_template_conditions(Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#2 /var/www/vhosts/example.local/releases/7/web/app/plugins/elementor/core/common/modules/ajax/module.php(175): call_user_func(Array, Array, Object(Elementor\Core\Common\Modules\Ajax\Module))
#3 /var/www/vhosts/example.local/releases/7/web/wp/wp-includes/class-wp-hook.php(308): Elementor\Core\Common\Modules\Ajax\Module->handle_ajax_request('')
#4 /var/www/vhosts/example.local/releases/7/web/wp/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#5 /var/www/vhosts/example.local/releases/7/web/wp/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#6 /var/www/vhosts/example.local/releases/7/web/wp/wp-admin/admin-ajax.php(188): do_action('wp_ajax_element...')
#7 {main}
thrown [array (
'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]

JS: showing 1 of 1JS: 2023-05-16 10:50:15 [error X 1][https://example.local/app/plugins/elementor/assets/js/editor.min.js?ver=3.13.2:3:681852] this.model.isValidChild is not a function

== Elementor - Compatibility Tag ==

Elementor Pro: Compatible

== Elementor Pro - Compatibility Tag ==

````