Fail to decode packet clientbound/minecraft:update_advancements

[Z3r0xh]

Describe the bug I think this problem persists in packetEvents, since removing packetEvents does not give this error

Software brand NullcordX 3.8.8 lobby pandaSpigot last build backends UniverseSpigot 1.21

Plugins Proxy: Lobby: Survival:

How To Reproduce Steps to reproduce the behavior: Just entering through the proxy and this error appears,

Sometimes it lets it play for a while but it ends up appearing

Expected behavior A clear and concise description of what you expected to happen.

Screenshots

Additional context Buil #536