Minecraft 1.16.5
Forge 36.2.20
Modpack: 1.3

I am hosting a LAN world with my partner and on her end it keeps randomly booting her with an error message of "Illegal packet received terminating connection." Checking the logs and crash reports we have nothing showing up beyond her being disconnected in the logs and no crash reports are being created. She doesn't even need to be doing anything. Any ideas?

EDIT: To further elaborate, the logs report her disconnect as:

[10:34:32] [Server thread/INFO]: kashcah lost connection: Disconnected
[10:34:32] [Server thread/INFO]: kashcah left the game
[10:34:32] [Render thread/INFO]: [CHAT] kashcah left the game