BUG: Fix small issues found with pytest-leaks #18671
Merged
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Backport of gh-18670 (with two small differences)
None of these are particularly worrying as they either usually only
leak reference (and not memory) or appear in rare or almost impossible
error-paths, or are limited to the tests.
Unfortunately, this PR will not apply to 1.20.x, due to small changes
in the overrides.