Someone mentioned it not so long ago: Android TagTime Doze incompatibility
And I’m working on it 
Actually I have already pushed a branch with a fix on GitHub and I’ve been dogfooding it for a few days, it seems to work. See GitHub - geekarist/TagTime at fix-doze
I was just waiting for my previous PR to be merged @dreev @insti, and then I’ll create the new PR.