I have an unhealthy cycle of this with Hearts of Iron IV a WW2 grand strategy game. I'll realize the embarrassing number of hours that I've put into the game and then I'll stop playing for a while. But then one of the big mods for it will update and then I dive back in and lose a weekend and then the process repeats.

The other game I consistently come back to is Threads of Fate or Dewprism it's a PS1 action-RPG with dual protagonists where each one has their own campaign or story to play through. I guess it's nostalgia that keeps me coming back to it, but it really wasn't a favorite game growing up and I didn't beat it until years after I'd gotten it. But every few years I'll just remember it out of the blue and get the urge to play through it again.