WowAce

I initially lodged this with Better Timeline (https://www.curseforge.com/wow/addons/better-timeline) but after more testing suspect the problem might lie with Bazooka. Essentially if all three addons are enabled the minimap buttons break. I've tested with literally just these three addons enabled and no minimap buttons show up, when there should at least be a DBM one.

If I enable all my addons except one of the three mentioned, then I see 14 or 15 minimap buttons. If I enable all of the three I see 6 buttons. So 8 or 9 minimap buttons are missing. Not sure why those half dozen minimap buttons are gathered successfully but not the rest. I guess something to do with load order, they're being loaded before Bazooka maybe?

I did split testing to work out the three addons that conflict. I also tested using alternate data broker bars (Arcana and NinjaPanel) and using either of them WoW displays minimap buttons properly.

I tested DBM with literally the minimal load possible (DBM core and DBM status bars only) and it still had the issue.

I tried disabling the DBM databroker plugin in bazooka and it made no difference.

No LUA errors are thrown at any stage. My initial testing I had bugsack and buggrabber enabled. When I was split testing I had them disabled and saw no errors either.

edit: Fixed mistake I made while explaining the problem.