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

Thanks for the report!

The failure depends on tests order execution (maybe you use -jN flag?).
Before default child watcher was SafeChildWatcher, not it is 
ThreaderChildWather.
The watcher is a global variable (a property of global event loop policy).

The failed test doesn't make sense for default ThreadChildWatcher but still 
valuable for old default SafeChildWatcher.
I've changed the test to use SafeChildWatcher explicitly.

See https://github.com/python/cpython/pull/13754 for the fix

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