Whoops, sorry about the limbo situation :/. I'll make a note to fix it in the next patch - thanks for reporting!
That is a surprisingly useful skill (at least from my point of view) :). I'm super grateful for the bug reports!
I actually haven't been able to reproduce the curse bug (though I have no doubt it happened) but I'm putting in some safeguards that should hopefully prevent both types of undeath from happening from the next patch on.