I don't if this is a bug or not but I think that the behaviour of the "auto track number" (when you put a # first on the track name) is not ok when using group tracks and particularly with APC.
Example :
there is 2 tracks in the group track
the number # of track 2 should be 2 and the number of track 3 should be 3 if the group track 1 is closed
(for matching with the APC faders)
and when the group track 1 is opened, the number # should be updated like here with the correct number
Mr Ableton thanks in advance for these very important requests I think!