Server disconnects player when player takes damage from mob

I am able to join the server and play as expected, but whenever I take damage from a mob (not fall damage) I am disconnected from the server.

Error message;

Connection Lost
Internal Exception; io.netty.handler.codec.DecoderException: java.io.IOException: Packet 0/66 was larger than I expected, found 3 bytes extra whilst reading packet 66

This is typed, not copied so there may be an typo in the error message.