Player in my server was hit with "clientbound/minecraft:map_item_data" after opening a chest from a Sunken Ship

In the early hours of the morning, a player in my server reported that they've been unable to rejoin after collecting a map from a Sunken Ship and was hit with "Internal Exception: io.netty.handler.codec.DecoderException: Failed to decode packet 'clientbound/minecraft:map_item_data'"

I can't seem to find solutions, as this particular problem seems to be recent for 1.21.1.