Admin Category Search by Store not working

(Edit: This was resolved in 4.60.4; I had been running 4.60.3)

I have some categories that are assigned to Store A, and some that are assigned to Store B. However, no matter which store I select from the Dropdown box, when click Search, the list always shows all categories. (Note that I have not entered any search terms; I just want to filter by store).

Is this a known problem? Could someone please point me to the part of the code that handles filtering so I can try take a look for myself?

Has recently stopped working or ?
Have you check the setting in Catalogue Settings
Ignore "limit per store" rules (sitewide) should not be enabled

In \Libraries\Nop.Services\Stores\StoreMappingService.cs, there is a generic method
... ApplyStoreMapping<TEntity>...

(You could set a breakpoint there just before you do your Search in Admin Categories to see if it ever gets there and then step through code)