When joining vanilla 1.17 world or server the game does not respond after showing text "saving world" for both servers and singleplayer, after the usual joining or loading world. It then highlights the "X" button in red, whites the screen and shows me the usual small box "not responding would you like for the application to respond or close it etc" if i select the wait for it to respond option it will clear the box from the screen and will reappear in a instant, so i have to close the program. I was not able to reproduce the problem after multiple tries. Sadly I forgot to screenshot the peculiar text while loading. It was a one time issue. I was using Vanilla tweaks resource pack, just in case i put the resource pack in the file attach section.

Thank you very much for your work to improve this wonderful game