Minecraft v1.16.5
Forge v36.1.24
Obfuscate v0.6.2
Create v0.3.1c

Create has a system where w can be pressed while hovering over one of their items, which will show a preview for what it can be used for. I randomly got a crash with this system and obfuscate after pressing w while my mouse was hovering over the Windmill Bearing item. It seems like it may be random.
Crash Report