Forge version 47.2.0 (mc 1.20.1)

when trying to enter a few chunk radius around an umvuthana grove, you get kicked from the server with the following message:

"java.lang.IndexOutOfBoundsException: readerIndex(32) + length(1) exceeds writerIndex(32): PooledUnsafeDirectByteBuf(ridx: 32, widx: 32, cap: 32/33)]}"

The server only shows the user disconnecting, and doesn't mention anything out of the ordinary in any logs.

Users can log in like normal when deleting the POS entries in the [userid].dat file located in the world folder, but instantly get disconnected with a similar message. (The numbers, here 32) change. Numbers seem to always be around 30.

This only happens on servers. (I only have access to this one server, but tried and failed to replicate it on ~5 singleplayer worlds.)

Here's the modlist I used: https://pastebin.com/qP0GZuVC
Here's the client's log (password = FA960rferX, 99% sure I scrubbed all important personal data but you never know): https://pastebin.com/Aggxajdi

Hmm... Does this still happen with only Mowzie's Mobs and Geckolib installed?

Hello, I have the same problem when I approach umvuthana and umvuthana crane, in my case I have the geckolib.

latest log: https://mclo.gs/DHP5P8J

Does it still happen with only Mowzie's Mobs and Geckolib installed?

the question is that I am the only one in the server that has this problem.

No, the question is:
"Does it still happen with only Mowzie's Mobs and Geckolib installed?"
Please try to reproduce the issue with only Mowzie's Mobs and Geckolib installed.