For *The other core* is looks a bit strange. The first backtrace shows and INVITE, but in the last comment is an OPTIONS.
It looks like the OPTIONS gets to a t_relay() (or something similar), although the request is generated locally, so this should not happen. Do you have any tm event route that does t_relay()?
I pushed a commit with a safety check, but this situation was not supposed to happen and may still have side effects even after this safety check.