I noticed whenever I use one of the figures (VS a card) and invite them to play in the RV, wisp shows up wherever they are supposed to be. Example I used my Tom Nook figure and when I went to Nooks home Wisp was there and was unable to do anything there.
Yep! Tom Nook and the other special amiibo figure characters can't be in two places at once so Wisp takes their place in their usual location while they are at the RV park for the day! So use the amiibo figures wisely! If you need to shop at Nooks or make a PWP with Isabelle one day don't scan their figures in that day.
If you scan in Tom Nook again, go to Nook's Homes first to do your business. Same with Isabelle if you want to build a PWP, or any of the shopkeepers. If you plan to scan in Reese or Kapp'n, do it at the end of the day before you finish playing.