current snap version on Fedora 30.

It seems to me that the algorithm that sorts what fields to show in the tab "other fields" is well identifying and showing those fields that are not default or optional.
The algorithm does not seem to check whether a "custom" field is displayed in another tab.

Use case: I have defined as general fields a field called "teachingmodule" and show that field in a separate tab. However, it is also shown in tab "other fields". The latter seems not clean.