Entity form fields get duplicated if added to the footer region in certain Layouts

We use the core "Field Layout" module to arrange fields in a layout on form displays of User, Profile and Node.

But we noticed a problem with the fields added in Footer region of certain layouts like "Sutro" and "Moscone". They appear twice in the content form.

I understand that it happens because there is a built-in footer region in all content entity forms by #2892304: Introduce footer region to ContentEntityForm → .

The solution is to rename the "footer" region to something else, like "contentfooter".

However, I understand it is not that easy and need to handle existing usage of affected layouts.

In my project I solved it by duplicating those layouts to custom module with footer name corrected.