Downgrading lwjgl3ify-2.0.0-alpha-8.jar to lwjgl3ify-1.5.16.jar (and changing the forgePatches jar back) fixed the issue

Crash log: https://mclo.gs/5qaInxu

Latest.log: https://mclo.gs/mp0mF4m

Same issue here. Tried everything to fix it.

Should be fixed in alpha 9