It is just mentioned in the crash-report
at com.lowdragmc.shimmer.client.shader.ReloadShaderManager.backupNewShaderInstance(ReloadShaderManager.java:114) ~[Shimmer-forge-1.20.1-0.2.4.jar%23427!/:?] {re:mixin,re:classloading}
o7 you are my hero, it works perfectly now
can i ask how do you identify which mod is the issue? cuz i might plan to add more and i feel bad being a total noob
thanks once again !!!