Forge Server - One player disconnecting

I have a user on my server that can't stay connected. No one else has the same issue. Looking through logs, he's always got a different error
He's playing Forge ATM10 TTS through Prism Launcher

I see a disconnect for io.netty.handler.codec.decoderexception: failed to decode packet 'serverbound/Minecraft:custom_payload'

Another:
Io.netty.handler.codec.decoderexception: java.util.zip.dataformatexception: invalid block type

Another:
Invalid stored block lengths on the java util.zip.dataformatexception

I'm not at the house so I can't copy paste logs, but I do have some prior screenshots I could share if they might help more

Anyone have any clues?
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