Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

Because it did work in a gray area.
The finalization logic has slightly changed, some tricks that were working 
before now fails.
Sure, other undocumented tricks start working :)

The rule of thumb: please stop and close the asyncio loop before exiting the 
program. This rule allows for avoiding situations like this.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42466>
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