[22:43:18] [main/ERROR]: Error occurred applying transform of coremod fairylights_core.js function PlayerInventoryTransformer
jdk.nashorn.internal.runtime.ECMAException: Failed to find instruction
at jdk.nashorn.internal.runtime.ECMAException.create(ECMAException.java:113) ~[nashorn.jar:?]
at jdk.nashorn.internal.scripts.Script$Recompilation$294$10994A$^eval_.L:2$atFirst$L:362$L:363(:371) ~[?:?]
at jdk.nashorn.internal.scripts.Script$Recompilation$261$10080AJA$^eval_.L:2$addTransformer-1$L:332$L:336(:337) ~[?:?]

   ~ This caused the modpack to instantly crash on startup, while using "Project: War Dance" they have fixed it on their end.

There will unfortunately not be any 1.16.5 releases to fix mod incompatibilities at this point.