Crash/DC when character making any map change

[josh5671]

Due to i unable to get any help on discord or other server, i try to raise it here, maybe someone able to give me tips where to start diagnosis.

it happen while going in portal or goto(for now), client will crash/dc with error below. but the character can be seen it 'arrived' on crashed map after you relog (i think this due to autosave feature?)

java.net.SocketException: Connection reset
at sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java:394) ~[?:?]
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:426) ~[?:?]
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:259) ~[Cosmic.jar:?]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132) ~[Cosmic.jar:?]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:357) ~[Cosmic.jar:?]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) [Cosmic.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788) [Cosmic.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724) [Cosmic.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650) [Cosmic.jar:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) [Cosmic.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [Cosmic.jar:?]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [Cosmic.jar:?]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [Cosmic.jar:?]
at java.lang.Thread.run(Thread.java:842) [?:?]