No pool draining if changes stream active

[ob-julian]

I have some code that creates automated changes() Listeners/Events/Cursor/Streams (whatever you wanna call them) for every logged-in user.
If I now try to restart the Service the r.getPoolMaster().drain(); doesn't work so I need to force quit the Service.
The thing is, I don't have/saved access to those Streams so I can't close them.
If I deactivate the code that creates the Streams r.getPoolMaster().drain(); works as expected.

Version:
Rethink: 2.4.2~0bullseye (GCC 10.2.1)
Dash: 9.6.3