incorrect number of fonts in collection shown

[PB-CCC]

I made a bug report about this bug already here:

References are not deleted from collection when fonts are deleted from disk

In FontBase v2.21.0, when fonts in a collection are deleted (context menu > delete from disk), the font reference is not deleted from the collection. The font will not be visible in the collection anymore, but the font counter of the collection does not change. At least in time, collection information is not accurate.

I also pointed out: If a design decision is based on the case of an exception (user mistakenly deletes font from collection), still the number of fonts FontBase shows is wrong after deleting a font from a collection. And this should be corrected.

As a followup question for the majority who do not delete fonts from a collection mistakenly: how does the design of Fontbase accommodate to show the correct number of fonts in a collection? Is there maybe some user-setting, or (context) menu item?