The ** pattern described here does not match any instances in some contexts, e.g. if it is the last piece of the pattern and there is more than one section in the preceding path. I believe this began occurring recently, as of the last one or two updates, but I might be wrong.
This makes some queries that appear in the form Some.Path.** is:SomeClass not work at all anymore, but Some.** seems to function fine:
Expected behavior
The ** pattern should match all descendants.