I also encountered that bug after fighting and losing to the bandersnatch, stuck on day 3 and time won't pass over 23:50, only able to progress it after beating her, I'm hoping it's related to your bandersnatch encounter bug because if so, try loading a previous save before the time gets stuckThis was on a fresh save on the newest version. And I also can't even get to the demo's final boss. It just stays stuck at 02:00 Day 3
get the clock tower key again and meet the bandersnatch at the clocktower gate
If all else fails start a new game, don't worry it's possible to beat the demo's final boss without having to repeat the cycle and starting fresh