OK - thank you. That makes sense and closes this issue for me. Though it opens up another one - why the TRV then isn’t properly recognised if the relevant quirk is already included. Same model seems to have worked for other people with that quirk, if not perfectly (ZHA - ZigPy - Thermostatic valve TS0601 doesn't work - #5 by cyberium)
I’ll do some more digging and try to understand a bit more.