Hi Michael, Thank you for your excellent research! I have forwarded the bug to upstream tracker.
Unfortunately, Debian doesn’t have the capacity to reliably forward bugs upstream in a timely manner, so to make sure that your reports actually reach us, I would appreciate if we could continue to communicate via our own tracker. Your other bug report was forwarded rather quickly as a matter of luck, and this one I have found by chance while trying to get grasp of what’s going on in Debian while preparing for a release. I haven’t looked into the details yet, but if you could please provide the patch with a test integrated in our test suite that would be great. All the best, Yury