Multiple Netty Epoll Errors

This is a different set of errors that that which occurs when doing large number of clones, but it has the same results.

Multiple Fill/Replace triggers massive numbers of different Netty Errors. This winds up randomly kicking all but one player on the server when it happens.

The commands do fill/replace across multiple instances of 32K blocks, there is a /stats command, and some scoreboard operations on each fill. Repeat this pattern a large number of times for different blocks/areas, and you reproduce the problem.

I get:

[16:21:22] [Netty Epoll Server IO #1/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[16:21:21] [Netty Epoll Server IO #1/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

[16:21:22] [Netty Epoll Server IO #2/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

[16:16:32] [Netty Epoll Server IO #2/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[Netty Epoll Server IO #4/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[16:17:41] [Netty Epoll Server IO #4/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

[16:17:40] [Netty Epoll Server IO #4/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 38016 (expected: 0 <= readerIndex <= writerIndex(19008))

[Netty Epoll Server IO #5/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

[16:21:33] [Netty Epoll Server IO #6/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[16:21:33] [Netty Epoll Server IO #6/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 25738 (expected: 0 <= readerIndex <= writerIndex(12869))

[16:24:20] [Netty Epoll Server IO #8/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[16:24:20] [Netty Epoll Server IO #8/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0, decrement: 1

[16:25:08] [Netty Epoll Server IO #8/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 25738 (expected: 0 <= readerIndex <= writerIndex(12869))

[16:17:39] [Netty Epoll Server IO #18/ERROR]: io.netty.util.IllegalReferenceCountException: refCnt: 0

[16:25:08] [Netty Epoll Server IO #19/ERROR]: java.lang.IndexOutOfBoundsException: readerIndex: 38016 (expected: 0 <= readerIndex <= writerIndex(19008))