get_block_wrapper_attributes() doesn't function properly when a Block is re-rendered after fields are edited

Describe the bug
When using get_block_wrapper_attributes() to generate classes and style attributes for a block based with ACF, the function works as expected when you first open the editor to a Post that contains an ACF block.

Example block output from a basic debugging block (when first opening the editor):

The selected animal is: alligator
The value of get_block_wrapper_attributes is: class="ext-acf-sample-block has-background has-sky-background-color wp-block-acf-ext-sample-block"

Here's the same block's debugging output after simply toggling a Select field in the right hand toolbar:

The selected animal is: cat
The value of get_block_wrapper_attributes is: class="ext-acf-sample-block"

To Reproduce
Steps to reproduce the behavior:

1. Add color support to an ACF block that has one or more editable fields.
2. Insert the block into a Post and set one or more colors
3. Update one of the block's editable fields

Expected behavior
The block's markup should include the classes from get_block_wrapper_attributes, just as it does when you first edit a page

Code
block.json

{
    "name": "acf/ext-sample-block",
    "title": "ACF Sample Block (EXT)",
    "description": "A basic ACF block.",
    "style": "file:./css/ext-acf-sample-block.css",
    "icon": "hammer",
    "category": "widgets",
    "keywords": ["sample", "test"],
    "acf": {
        "mode": "preview",
        "renderTemplate": "block-template.php"
    },
    "supports": {
        "jsx": true,
        "align": true,
        "alignText": true,
        "anchor": true,
        "color": {
            "background": true,
            "text": true,
            "link": true
        },
        "mode": "preview",
        "spacing": {
            "margin": [
                "top",
                "bottom"
            ],
            "padding": true
        }
    },
    "example": {
        "attributes": {
            "mode": "preview",
            "data": {
                "ext_acf_block_preview": 1
            }
        }
    }
}

from block-template.php

// Create class attribute allowing for custom "className".
$class_name = 'ext-acf-sample-block';
if ( ! empty( $block['className'] ) ) {
	$class_name .= ' ' . $block['className'];
}

// process our custom field
$selected = get_field( 'select_an_animal' );

$block_wrapper_attributes = get_block_wrapper_attributes(
	array(
		'class' => esc_attr( $class_name ),
	)
	);
?>

<div
	<?php
	echo wp_kses_data(
		$block_wrapper_attributes
	);
	?>
>


// i'm having trouble making the opening php tag show in the comment
	echo "The selected animal is: " . $selected ;
	echo "The value of get_block_wrapper_attributes is: " . $block_wrapper_attributes;
// closing php tag here	

</div>

Version Information:

• WP 6.3.1
• PHP 8.0.30
• ACF Version Pro 6.2
• Chrome

Start with block.json and block-template.php, then reproduce the issue in WordPress 6.3.1 by changing an editable ACF block field after applying color support. Trace why get_block_wrapper_attributes() loses the generated classes during re-rendering; done means the classes and style attributes remain in the block markup after field edits.