In post #4 I'd mentioned this being a duplicate, here's another:
That one's much older, prior to my being aware of the issue. Sadly I overlooked the issue earlier :^(
After seeing the earliest reports of this I even tried a distribution upgrade but failed to recognize that people simply don't understand the difference between drive and partition designations, thus my (invalid) bug report:
I'm sure if I spent more time I could yield more results.