[issue40173] test.support.import_fresh_module fails to correctly block submodules when fresh is specified

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +27024
pull_request: https://github.com/python/cpython/pull/28658

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<https://bugs.python.org/issue40173>
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