I'm trying to get the categorized search working for custom (virtual) entities, but, for some reason, those entities are not appearing in the list of searchable entities.
The custom entities are apperaring as expected in the old interface:

but in the unified interface, some of the custom entities are missing. I cannot figure out what's going wrong.

Did anyone face this issue in the past, and how did you get it resolved? The entities are added to the categorized search list, the quick find filters have been modified to contain the fields I want to search on...
Thanks in advance
Jef