there was no crash report so i asked chatgpt and he told me to send latest logs.
i sent them and he said there was a crash. he said to disable iris or to downgrade to 1.8.x but i cant because im on 1.21.6 so either disable it or wait for a patch.
this is the exact error:
java.lang.AssertionError: Can't.
at iris$getRenderTarget (class_1921.java:1351)