[issue44050] [subinterpreters] _PyImport_FixupExtensionObject() regression in Python 3.9

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +27086
pull_request: https://github.com/python/cpython/pull/28738

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44050>
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