The game crashes when Alex mobs is opened in version 1.20.1, more specifically when the JEI mod (Just Enough items) is installed, when you see the display of an item in the window when you open the inventory, that is the moment the game crashes, I suppose it is because of some mob that is previewed.

I have the same problem. Of course, I don’t really understand what is written in the logs, but it seems to me that the transmutation table is involved here. I hope this problem will be fixed.
crash-2023-07-24_16.42.59-client.txt

Also crashes REI