[Bug]: Custom map with linked favorite categories cannot be displayed via Share link

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Maps app is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Custom map with linked favorite categories cannot be displayed via Share link.
When access the custom map with the generated share link, it just shows a map without any favorite category.
It can successfully shared and displayed to other accounts though.

Steps to reproduce

1. Create new custom map named 'CUSTOM MAP'.
2. In the 3-dot menu of a favorite group in Default map, select 'Create share line'
3. In that 3-dot menu of a favorite group in Default map, select 'Link to map'
4. Choose 'CUSTOM MAP'
5. In the 3-dot menu of 'CUSTOM MAP', choose 'Share'
6. Click the '+' sign beside 'Share link'
7. Click the 3-dot beside ''Share link', choose 'Copy link to map'
8. Access the copied link, it shows a map without any favorite category

Expected behavior

The access link should show the linked favorite categories.

Installation method

Other

Operating system

Other

PHP engine version

PHP 8.1

Web server

Nginx

Database engine version

PostgreSQL

Is this bug present after an update or on a fresh install of the server?

None

Is this bug present after an update or on a fresh install of the app?

None

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

Enabled:
  - activity: 2.21.1
  - calendar: 4.7.6
  - circles: 29.0.0-dev
  - cloud_federation_api: 1.12.0
  - comments: 1.19.0
  - contacts: 6.0.0
  - contactsinteraction: 1.10.0
  - dashboard: 7.9.0
  - dav: 1.30.1
  - end_to_end_encryption: 1.15.2
  - federatedfilesharing: 1.19.0
  - federation: 1.19.0
  - files: 2.1.0
  - files_downloadlimit: 2.0.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - firstrunwizard: 2.18.0
  - groupfolders: 17.0.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - maps: 1.4.0
  - memories: 7.3.1
  - nextcloud_announcements: 1.18.0
  - notifications: 2.17.0
  - oauth2: 1.17.0
  - onlyoffice: 9.2.2
  - password_policy: 1.19.0
  - photos: 2.5.0
  - previewgenerator: 5.5.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - recommendations: 2.1.0
  - related_resources: 1.4.0
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - support: 1.12.0
  - survey_client: 1.17.0
  - systemtags: 1.19.0
  - tasks: 0.16.0
  - text: 3.10.0
  - theming: 2.4.0
  - twofactor_backupcodes: 1.18.0
  - twofactor_webauthn: 1.4.0
  - updatenotification: 1.19.1
  - user_status: 1.9.0
  - viewer: 2.3.0
  - weather_status: 1.9.0
  - workflowengine: 2.11.0

Nextcloud Signing status

No response

Nextcloud Logs

No response

Browser Console

No response

Additional info

No response

No source file or test is named in the report. Reproduce the custom-map and share-link flow, then trace the share-link entry point and linked favorite-category loading; done means the copied link displays the linked categories and a regression test covers the behavior.