[Geschlossen] WPML ACF Field Translation Settings – "Copy" can't be changed

Background of the issue:
I am trying to set the correct translation behavior for our ACF fields in WPML. Specifically, I want no field to have the 'copy' setting, but instead to be set to 'copy once'. We attempted to change all field group translation settings from 'Expert' to 'Different fields in all languages' on a Test-Page (versteckter Link).

Symptoms:
Every time I try to set fields to 'copy once', they revert back to 'copy'. We cannot view and edit all fields at once under 'Settings > Translations Custom Fields' due to the lack of filter or mass-edit options, and loading all fields results in an out-of-memory error. The most critical field affected is 'column-builder', which is a flexible content field and contains almost all of our other fields.

Questions:
How can I permanently fix the issue of fields reverting to 'copy' instead of 'copy once'?
Is there a workaround to set the correct translation behavior for all parent and nested fields?