I was testing Farm Adventure II with the new snapshot and I wanted to open my Guide Book, but the game hadcrashed. I re-ran the game and tested to the open the GUI of the Spells, and the game has re-crashed. I ran the game for a third time, and try to open The World Change Block, and the game didn't crashed. I can use it perfectly. So, I tried to see what was wrong, but I didn't find something. I have finally decided to search on the website, but I found nothing.
What makes me think that this is a bug is that I had already tried to open these same GUIs in 2020.1 and it worked perfectly.