I was playing my modpack with quark being the only mod that adds items and when loading the world it freezes and in the console it gives me a lot of: https://pastebin.com/22PRnE2v (also happens when you create a new world and load it again!).Sometimes the world opens, but player reseted( no items or xp in spawn)(espero que consiga resolver isso, Vasco , porque estou com medo de perder o mundo que investi dias :-( )

Try to update java, forge, autoreglib, quark, etc. I don't know what this crash is, and it doesn't mention quark at all.

i tested it! i made a instance just with quark and autoreg, loaded a world, generated some terrain,saved it and reloaded it; it froze in 0% giving in the console the same log!! i tried it with forge alone and 100% of the times,it worked just fine!!forge 14.21.1.2406 , quark r1.2-100 and autoreg 1.3-13