Error when I try to access my server with the version 1.20.4 of minecraft

[IL25-code]

Describe the bug
When I add the plugin Plugin Hider Pro it gives an exception and I can't join the server. I contacted them and they told me to contact you.
However I can't join with the version 1.20.4 but I can join with almost any other version like 1.20

The exception is:
io.netty.handler.codec.DecoderException: java.io.IOException: Packet configuration/0 (xj) was larger than I expected, found 479 bytes extra whilst reading packet 0.

Software brand
Velocity 3.3.0-SNAPSHOT
Paper Servers: Pufferfish 1.20.4

Plugins
ajqueue, apollo, badlion-modapi, jpremium, serverlistplus, litebans, luckperms, skinrestorer, slashhub, tab, ultrastaffchatpro, viaversion, viabackwards, PL-HIDE pro, packetevents

In the paper server we have:
Citizens, CoreProtect, DecentHolograms, DeluxeHub, DeluxeTags, Essentials, EssentialsChat, EssentialsSpawn, FastAsyncWorldEdit, ItemAdder, JPremium, LoneLibs, LPC, Luckperms, Multiverse-core, PlaceHolderAPI, PlugManX, ProtocolLib, SkinRestorer, SuperVanish, TAB-Bridge, UltraRegions, Vault, VoidGen, Vulcan, WorldGuard, WorldGuardExtraFlags, PL-HIDE pro, packetevents

[retrooper]

I'm going to talk to the developer and look into this issue.

[retrooper]

You have ViaVersion on your proxy server. Please move it to the backend servers as PacketEvents has not been thoroughly tested to support ViaVersion on proxy at this moment. Let us know if it works for you.

[IL25-code]

I'm going to talk to the developer and look into this issue.

Ok thank you

[IL25-code]

You have ViaVersion on your proxy server. Please move it to the backend servers as PacketEvents has not been thoroughly tested to support ViaVersion on proxy at this moment. Let us know if it works for you.

I tried to create a testing server using the bukkit version of it, but it gives the same error. I will try to remove viaversion from the testing server and let you know if something changes.