[Python] Python logging StreamHandler causes stack_info to print twice

I'm using Python 3.9 and the logging module. It seems that when I make use of a QueueHandler and the stack_info feature, the stack trace information prints twice. Anyone know how to avoid this duplication?

This works correctly without the QueueHandler:

import logging
import time

stream_handler = logging.StreamHandler ()

lo = logging.getLogger ()
lo.addHandler (stream_handler)

lo.error ("This is an example error", stack_info = True)

time.sleep (1)


This includes the stack trace twice, and the only change I made was to insert a QueueHandler/QueueListener:

import logging
import logging.handlers
import queue
import time

stream_handler = logging.StreamHandler ()

q = queue.Queue (-1)
queue_handler = logging.handlers.QueueHandler (q)

lo = logging.getLogger ()
lo.addHandler (queue_handler)

queue_listener = logging.handlers.QueueListener (q, stream_handler)
queue_listener.start ()

lo.error ("This is an example error", stack_info = True)

time.sleep (1)


Output with the QueueHandler/QueueListener arrangement is the same as without, except the stack trace appears twice:

# ./logtest-q.py
This is an example error
Stack (most recent call last):
File "/home/jcharles/./logtest-q.py", line 19, in <module>
lo.error ("This is an example error", stack_info = True)
Stack (most recent call last):
File "/home/jcharles/./logtest-q.py", line 19, in <module>
lo.error ("This is an example error", stack_info = True)

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