@hube2 The current issue I see is that the acf/settings/save_json filter doesn’t override the new behavior in 5.9.0. It is ignored now so if you’re not using it you should be fine. If you are using it there is no effect from it anymore. The documentation either needs to be updated to reflect that it no longer has any effect (and should be removed) or the logic should be changed so it is a higher precedence than the new 5.9.0 functionality.
