Fabric API Incompatibility

[Clumsius]

/viaversion dump Output

https://dump.viaversion.com/2535c9087b8ce7685075a5efc21c4cdb610a874855dbd6448fc380100f8fcdea

Console Error

No response

Bug Description

When inserting Fabric API into the mods folder of a 1.20.4 Server, the client lower than 1.20.4 can't connect even if the server has latest Via Fabric, Viaversion, ViaBackwards and ViaRewind.

Steps to Reproduce

1. Put the Fabric API Mod into the mods folder of the server
2. Join with a lower version.

Expected Behavior

Player can join and experience Minecraft.

Additional Server Info

fabric-server-mc.1.20.4-loader.0.15.10-launcher.1.0.1 and fabric-api-0.97.0+1.20.4

Checklist

• I have checked if this is specific to ViaFabric platform, and doesn't happen when running it on other platforms (Paper/Sponge/Velocity/Waterfall).
• I have included a ViaVersion dump.
• If applicable, I have included a paste (not a screenshot) of the error.
• I have tried the latest build(s) from https://ci.viaversion.com/ and the issue still persists.

[Kichura]

Duplicate of ViaBackwards' #642.