Custom Taxonomy metabox information not saved properly

[teachmeter]

Describe the bug
When having a custom post type taxonomy (hierarchical) when saving a custom post with ACF enabled the taxonomies are not saved all but only 1 selection.

To Reproduce
Steps to reproduce the behavior:

1. Go to custom post
2. Select custom taxonomies from standard wordpress metabox (select multiple)
3. Click save post
4. See only 1 taxonomy saved

Expected behavior
All taxonomies should be assigned to a post

Code
The following line seems to be the problem
plugins/advanced-custom-fields-pro/includes/fields/class-acf-field-taxonomy.php:414

Changing the following line
from
wp_set_object_terms( $id, $term_ids, $taxonomy, false );
to
wp_set_object_terms( $id, $term_ids, $taxonomy, true ); seems to solve the problem

Version Information:

• WordPress Version 6.8.2
• PHP Version 8.3
• ACF Version ACF PRO 6.5.1