Experienced a crash on a server I'm running with Jade shields. Blocked an arrow from a Piglin, immediate crash. Here's the report.
Version: Minecraft 1.20.1, NeoForge 47.1.106
crash-2024-09-13_22.01.20-client.txt

Neoforge is not supported until 1.21. The changelog states that clearly

Ahh I see now. Would downgrading the mod version fix this issue by chance, at least until the next version? Or is this simply a problem that will persist with 1.20.1?

Version 3.1.0 of sullysmod is compatible with Neoforge
But I'd advise just not using neoforge on 1.20.1