Marco helped me debug this (thank you!) and it seems this would likely be resolved by the fix in bug 1939597. For some reason, the `frecency` column for this site in `moz_places` is 0, and the last visited date is almost 2 months ago - even though the tab is pinned and as this is a Windows desktop machine, it gets shut down at night and boots fresh every morning, and so does Firefox (with automatic session restore turned on), and I would have expected that to "count"... I also don't recall seeing an error on this page recently, but of course it's possible I'm misremembering.
Bug 1945063 Comment 1 Edit History
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Marco helped me debug this (thank you!) and it seems this would likely be resolved by the fix in bug 1939597. For some reason, the `frecency` column for this site in `moz_places` is 0, and the last visited date is almost 2 months ago - even though the tab is pinned and as this is a Windows desktop machine, it gets shut down at night and boots fresh every morning, and so does Firefox (with automatic session restore turned on), and I would have expected that to "count"... I also don't recall seeing an error on this page recently, but of course it's possible I'm misremembering. I'll verify early next week when this profile will update to 137 beta.