The problem was partially solved, I’ll explain.
Before the fix you sent, the problem occurred as soon as ACF was activated, meaning, even when no WYSIWYG field was present, the editor’s advanced controls were missing.
Now, the problem only occurs when I add the WYSIWYG field and leave the default editor as well:
This is the ACF WYSIWYG field:
And this is the default editor:
As soon as I’ll remove the WYSIWYG field – the advanced controls are back.
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