Im am facing an issue where I could not set my Post Type (I.E Real Estate) when a double group cloneable (meaning a parent group which is cloneable & a child group which is cloneable too) is applied in my custom field group (https://prnt.sc/gtgYmgsOZCue), I could not set my post type (https://prnt.sc/5M7UlIGGoNew) in here, everything I save it will be reset to "Post".
I have max the input variables to 10,000. It smoothens the speed of opening the custom field groups. However, not sure whether the issue has been resolved. But I will keep an eye on it and update later on.