I tried /say @e[team=] in a repeating_command_block and instantly lost connection with following error message: Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundException: readerIndex(1) + length(1) exceeds writerIndex(1): UnpooledHeapByteBuf(ridx: 1, widx: 1, cap: 1). Everytime I try to reconnect, it connects and when it has downloaded the world, I get the same error again. I think this is because of the chat spam/overload, the command produces. There should be a message length limit, that does not just kick you, but say there would be to much output. Tested the same in single player, but worked fine, without any crash-like behavior, but with a lot of spam. I could not test on another server yet, but I don't think this is nessecary.