I'm using the PEX framework to create non-polling Business Services in Python. Below is the code I've used to instantiate my Python Business Service from the application I have written:

conn = iris.connect(...)
IRIS = iris.createIRIS(conn)
#...#"Demo.PEX.FlaskPEXService"

The Service works fine, messages are received properly by the target Business Process as defined by my PEX service, however, every time I run Director.CreateBusinessService(), the created job terminates 'unexpectedly' once I close the IRIS connection.

I'm curious about how embedded Python is handled by %CSP classes, particularly in the case of defining REST endpoints on IRIS.
Here is a simple dispatch class for the endpoint /api/pythonapp on my local IRIS instance (2022.3):

ClassExtends%CSP.REST

Making a GET request to <ip:webport>/api/pythonapp/test does not return an error, but returns "wstr%SYS.csp" which is interesting.

Can anyone shed light on this behaviour or has achieved an embedded Python dispatch class without passing values to ObjectScript methods for writing?