Failure in gating (we see the same in our CI):

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FAIL: test_add_remove (mdraid_test.MDTestAddRemove)
Verify that it is possible to add a device to and remove from an MD RAID
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Traceback (most recent call last):
File "/var/str/source/tests/mdraid_test.py", line 412, in test_add_remove
self.assertEqual(md_info.spare_devices, 0)
AssertionError: 1 != 0

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This is most likely an issue in mdadm which was rebased recently in both RHEL 8 and 9, I'll investigate the issue further and move it to mdadm if this turns out to be really problem in mdadm and not in libblockdev or our test suite.