Played on a singleplayer world without closing the game for about 10 hours, while making a villager trading farm. Upon trying to trade with more than 2 villagers at once, the game would act like a laggy server, with me being able to move around like normal, but with none of my interactions going through. EXP orbs would circle around me without me getting any levels, clicking on villagers would do nothing, and upon relaunching the game after it inevitably crashing, I was back at a point I had been about 5 minutes prior, acting like a rollback. I recreated this once only, as this is a quite time-consuming glitch to do, and it did the exact same thing.