nioEventLoopGroup thread proliferation

Dear developers,

I did a stability test with the plc4x 0.8.0 and pool2 library.

The test is just reading continuously a couple of DataBlock from a S7 Siemens 1200 PLC.

During the test I have used VisualVM like profiler to inspect the use of the Heap and the threads and I found something strange.

The test runs for a couple of days and I have sampled the threads in a couple of snapshot found that the number of running nioEventLoopGroup thread increase and doesn't seems to be bounded by a limit.

These are the total of the Threads of the applications at 2021-01-31 at 11.34.15; the total number is 246 and the number of nioEventLoopGroup is 192

These are the total of the Threads of the applications at 2021-02-01 at 09.14.02; the total number is 358 and the number of nioEventLoopGroup is 305

 Form the profiler two of this thread are:

It seems a leakage and seems a dangerous one. 

I think the problem is inside the pool2 library but I am note sure. 

What do you think? 

Regards,

S.