1.21.10 client on 1.21.11 server: "Failed to decode packet 'clientbound/minecraft:update_mob_effect'" when sitting on a nautilus

[Brokkonaut]

'/viaversion dump' Output

https://dump.viaversion.com/07979916b8b303b5fbe0ffd4870e7eb4195ce625e5320227490489ef8b200c8d

Server/Client Error

https://cpaste.de/egegaveked.less

Bug Description

Client is 1.21.10, Server 1.21.11 - When I try to sit on a nautilus i am disconnected with Failed to decode packet 'clientbound/minecraft:update_mob_effect' (see stack trace above)

Steps to Reproduce

1. Login with 1.21.10 on an 1.21.11 server
2. Tame a nautilus with pufferfishes
3. Right click that nautilus to ride on it
4. -> exception

Additional Server Info

No response

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. Velocity), not on both.
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried a build from https://ci.viaversion.com/ and the issue still persists.

[Barvalg]