Most of the time you get track 1-24,not 1-17/1-7(disc 1/2), so it still doesn't need a disc number. And surely if it is a single disc, I don't need disc 1.
This is finicky for sure, but before beets I cleared disc number from all albums during tagging and I noticed now it is back even on things I know are just one disc.
If not, I'll live with it
Or see if I have any disc 2 at the end and if not. Clear disc number