update_post_thumbnail_cache returns notice when get_the_post_thumbnail used with ID after setup_postdata()

[tomcent]

Situation:

• Inside main loop
• foreach over array of (related) post_id's,
• use setup_postdata($post) for each item
• Items call get_template_part(something)
• Template parts uses get_the_post_thumbnail which allow a post_ID
• get_the_post_thumbnail calls update_post_thumbnail_cache (because in_the_loop)
• update_post_thumbnail_cache gives notice on line 101: Trying to get property 'ID' of non-object
• Restore main loop with wp_reset_postdata()

Possible fix:
Change this

<?php
foreach ( $wp_query->posts as $post ) {
        $id = get_post_thumbnail_id( $post->ID );
        if ( $id ) {
                $thumb_ids[] = $id;
        }
}

To this

<?php
foreach ( $wp_query->posts as $post ) {
        if (is_object($post)) {
                $post = $post->ID;
        }
        $id = get_post_thumbnail_id( $post );
        if ( $id ) {
                $thumb_ids[] = $id;
        }
}

in /wp-includes/post-thumbnail-template.php line 101

[tomcent]

Replying to tomcent:

update_post_thumbnail_cache gives notice on line 101: Trying to get property 'ID' of non-object

Change in /wp-includes/post-thumbnail-template.php line 101

This is now line 106 after the WP 5.5 update.
The issue is still present on this version.