I apologize for delayed response, guys, I guess it's the same bug with level transition that the game still experiences from time to time. Try to load new save again, it can solve it from time to time. The current public version will not be updated soon, partially because I'm close to finishing the main plot of this game and it will be sold on itch with a finished plot, partially because I have to focus on its sequel which will fix lots of existing problems. Thanks and have a nice day!