Trapped in an invisible box

[Voideka]

I tried to log in on my main, but I could only hearth, which sucks, so I tried my alt instead. She was in the middle of a river (I had logged her off next to a boat, but not in one), and was trapped due to deep water. I managed to walk her S and onto shore, where I have since discovered she is in an invisible box. The box appears to be about 9 tiles from east to west, but I don't know the n-s measurement because I have a river in the way. This is certainly new to me, which is why I have not yet logged to my village. If you guys (J/L) are interested in investigating, lemme know and I'll PM you the account name, char name is Frank. I'm leaving her in the box for now.