Chris Jerdonek <chris.jerdo...@gmail.com> added the comment:

The Django details might not matter so much at this point, but to add to 
something I said above: It might not only be process_exception_by_middleware() 
as I mentioned, but also asgiref's sync_to_async() function. In that function, 
you can see an already active exception being re-raised (here the exc_info 
comes from sys.exc_info()):

# If we have an exception, run the function inside the except block
# after raising it so exc_info is correctly populated.
if exc_info[1]:
    try:
        raise exc_info[1]
    except:
        return func(*args, **kwargs)
else:
    return func(*args, **kwargs)

https://github.com/django/asgiref/blob/edd0570a4f6e46f0948afa5ef197a192bb95b7b7/asgiref/sync.py#L306-L314

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<https://bugs.python.org/issue40696>
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