I've tried learning to cope with that, and Mahjong is actually one of the few things that works. Otherwise I usually fall into a stasis trying to plan something that I want to do (even though I don't really _want_ to plan it, I just want to finally enjoy it), walking around the house, waking up my wife trying to discuss whether I should restart here, trying to discuss the 'optimal route' I need to take in order to not forget anything (and then I find out 50 hours in that I did, in fact, forget something, and have to restart - I've already poured in several hundreds of hours into RDR2, and I never went past chapter 2 - an open world game with a lot of random events is an absolute incompatible nightmare for me).
Mahjong has always (well, during the ~11 years or so that I've known this game and started playing on Tenhou) been my main retreat when I start procrastinating as a result of this thing.
I don't know where it started, but it's always felt not like constructive completionism, but rather a fucking obligation that I impose on myself despite me not really wanting it. Maybe it has something to do with Might and Magic VII and that goddamn tutorial dragon that I looted for hours with save/load and the occasional case where his corpse doesn't despawn on looting, coupled with another occasional case of dropping extremely rare shit. I spent hours when I was a kid getting all the 'occasionally rare' shit to proc together with the 'occasionally rare' situation where the corpse doesn't despawn.
Most importantly, I have no fucking idea how to fix it. DS3 wasn't that bad, I just had to touch all tutorial messages and do everything 'tidy and nice', but RDR2 broke me. Like, the thought of coming back to that game is filling me with dread, I have 46 A4 sheets of paper filled with various checklists and tables I've prepared after all the failed runs, and I want to finish that game, but I am just afraid of coming back to it, so Mahjong it is. ;_;