The link I posted in #18 has got a lot longer now. Players are in a stressful situation so its difficult to understand what is being said.
It does seem (& incl what
@TheHeroOfTime has found out) that any tool (possibly any item?) that you leave in the care of Kapp'n, when you go to CT islands, can then disappear & you never get back.
Do you need to put them in a closet (Post #20) or would placing tools(items) in save letters(in your pocket inventory)/dropped in your town first, be enough?
Patterns - don't understand what
@TheHeroOfTime / Trippy is saying. But the advice is to save patterns with Ables before doing any CT island trips.
When you are sent back to your town - there is a difference of opinion - the players in the Bell Tree Forum link all think they are going back to their own town.
I think Trippy is saying you are going back to a copy - similar to a Dream Address copy of your town.
The issue then, is it safe to save, personally I wouldn't want to, best to error/reset? When does the game automatically save, in which case there may not be a choice to reset to remove what the hacker may have done.
If I got into this situation on a CT island as I've said before, it might be difficult to work out when its safest to flip that wifi switch. When you are in a loop showing the little white boat/Kappn' loading screen, it wouldn't feel like the safest time to error.
Players with a new 3ds don't have the ability to flip the wifi switch. All you can do is power off/turn router off.