cant join 1.12.2 server(1.20.1 waterfall →1.12.2 spigot) by 1.20.1 client

[wksdjfhgfrejwksld]

/viaversion dump Output

https://dump.viaversion.com/8c3d0d330f5fea202435be69c07a3033c1fbfb2588fdc065ad5f5b84facb1cd9

Console Error

bungeecord console:
https://paste.gg/p/anonymous/9c4398226f3f4122958f6364c0810f4d
bedwar server console:
[11:11:27 INFO]: UUID of player darkshabby is 59de5f87-c831-3783-a35b-14609dcc7739
[11:11:27 INFO]: darkshabby[/180.106.165.89:53577] logged in with entity id 37 at ([lobby]0.5, 82.0, 0.5)
[11:11:27 INFO]: darkshabby lost connection: Disconnected

Bug Description

i was kicked when i tried to join 1.12.2 server

Steps to Reproduce

1.join server by 1.20.1 client(i can join 1.20.1 lobby)
2.run"/server bedwar"(1.12.2)
3.i was kicked

Expected Behavior

join bedwar server

Additional Server Info

i used bungeecord and i installed via on bungeecord

Checklist

• Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. BungeeCord), 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 the latest build(s) from https://ci.viaversion.com/ and the issue still persists.

[Barvalg]