What is the issue?
when switch to the kappa pt,game cashes,i disabled every mod one by one,then i found the chunksfadein cause the crash

Conditions to reproduce
just enable the kappa pt shader with chunksfadein

Does this issue appear only with Sodium, Iris and Chunks Fade In?
Yes

Full Minecraft logs
https://mclo.gs/pls0LTr

Fixed in 0cd0ae4, after some time I'll also port these changes to other branches