winetest can't remove its temp directory

Hi,

does anybody else see a message from winetest.exe about
not being able to clean up at the end?
This happened with e.g. winetest-1.4-rc2 and some earlier ones.

Indeed, a temp directory with all the extracted
*_test.exe is left half-full.  It looks like files got
deleted in alphabetical order starting with 'a'.
mmdevapi_test.exe is the first one left, up to x*_test.exe

Today's "[PATCH 2/4] mmdevapi/tests" adds a missing
IAudioClock_Release(acl);
Perhaps that prevented mmdevapi from cleaning up?
How to explain such an effect?
How to allow winetest to clean up and exit properly?

That does not seem to be issue #12801.

Thank you for your help,
    Jörg Höhle