The event loop for QtAsyncio does not call its exception handler with the signature given in Python's documentation for asyncio, but it should. This will lead to a user setting the exception handler to the wrong signature and result in missing argument TypeError at the exception handler call, after an exception occurs in an async task:

https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.set_exception_handler

> handler must be a callable with the signature matching (loop, context), where loop is a reference to the active event loop, and context is a dict object containing the details of the exception

Observe how it's called in Cpython's BaseEventLoop implementation:

https://github.com/python/cpython/blob/fe0e921817a7f96c62c91085884ab910859328ce/Lib/asyncio/base_events.py#L1929

self._exception_handler(self, context)

Observe how it's called in QtAsyncioEventLoop:

https://code.qt.io/cgit/pyside/pyside-setup.git/tree/sources/pyside6/PySide6/QtAsyncio/events.py#n620

self._exception_handler(context)