Closing as "incomplete" for now; per recent comments, we're not sure how to reproduce this, and even the original reporter couldn't reproduce in private-browsing-mode which suggests there's some unknown state required. So, this doesn't seem to actually be a broad webcompat issue. And we've improved the UX here a bit in bug 1916193.
Bug 1913147 Comment 25 Edit History
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Closing as "incomplete" for now; per recent comments, we're not sure how to reproduce this, and even the original reporter couldn't reproduce in private-browsing-mode which suggests there's some unknown state required. So, this doesn't seem to actually be a broad webcompat issue. And we've improved the UX of at least one of the flows here in bug 1916193.