Monitor cep processes windows

Hi there.

I've searched for an answer to the following and tried a few examples I found.

I'm running a python script from Premiere Pro 24.

Using

var result = window.cep.process.createProcess(path_to_python_exe, path_to_python_script)

The python script then generates a json file.

Using result.data i can get the pid of the process.

But. window.cep.process.onquit(result.data) or process.isRunning never trigger and can't seem to find the process.

I'm on windows.

Is this a known bug? Is the process detached somehow? I put a delay at the end of the python script in case it was finished too fast, but it made no difference. The json file gets created each time.

Any help appreciated 

Cheers