Describe the bug, provide any errors

• https://pastebin.com/dz8ZUyph

How can we reproduce it?
Steps to reproduce the behavior:

1. use 1.8.9 client to join 1.16.5 server

Expected behaviour

• just can't join server

Screenshots
If applicable, add screenshots to help explain your problem.

ViaVersion Dump:

• https://dump.viaversion.com/699e1dc7b58e216e0ae5e6e260ac06b0144985b3f4d878f703aa451400dc623e

Additional server info
Waterfall

Checklist (mark with [X] to check)

• 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
• I have looked at https://www.spigotmc.org/resources/viarewind-legacy-support.52924/ and it does not offer a fix for my problem

IMPORTANT: Follow the Checklist or we can't reproduce your issue and your issue will be close

solved in #312