The Amiibo-specific glitch that resulted in a blank name on the sold plot has been fixed for weeks.
The "Moving Out" glitch that affected basically all villager adoptions (not just Amiibo campers) has also hopefully been fixed since the last patch. There weren't specific patch notes, but there haven't been any reports of the glitch, at any rate. This glitch and the previous glitch aren't the same.
There are still a few glitches that remain that involve all campers (not just Amiibo), but they generally affect the island where the campsite belongs to and not visitors trying to adopt villagers like in the patched glitches. For example, there's a glitch where if a camper forces out a villager, and then you either TT backwards/TT forwards and skip the plot sold day/don't load the save file on the plot sold day, the camper's house will still have the exterior of the previous villager. Another glitch happens if you force out a villager on the same day that another player is in boxes. The game doesn't process two move-outs correctly, so one villager will remain in boxes day after day.