This happened today, and even after a few reloggs, my Buddy just refuses to unfuse. I don't know how it was possible, but I'm not mad about it either.
For context: my buddy is Melmetal and the shiny Alolan Exeggutor was sent to defend an arena about 2 weeks ago and hasn't returned yet. Maybe someone has already met with this glitch, otherwise, happy glitchhunt to anybody who tries to reproduce it.
by Lemenopy