Remove the (not thread.is_alive()) assertion #2115
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2A93
This assertion apparently has a small chance of failing, possibly by a race condition. It was already skipped on Python 3.13+.
Fixes #2111
Having said that, I don't understand the underlying issue. https://github.com/he1pu has posted a testcase in #2111, and the patch does fix his testcase.
FWIW the assertion was originally added in 8622a2b