What happens if a black hole and a stable wormhole interact?

Granted we don’t know that stable, transversible wormholes exist. We know they are mathematically consistent with the theory of general relativity. With enough negative energy, such a wormhole could be opened and kept open. We don’t know how to generate large fields of negative energy, but that doesn’t mean it cannot be done. Stephen Hawking, Kip Thorne and other leading physicists believe that the Casimir effect demonstrates that negative energy fields can be generated. So let’s allow hypothetical stable wormholes to be a reality for the purpose of this question.

What happens when a black hole and a stable wormhole interact? Does the black hole produce a white hole on the other side of the wormhole, or eat the negative energy holding the wormhole open.

Here’s the whole lot of hole questions from the black hole series:
1  —  “Can a black hole overeat?”
2  —  “How big is your average black hole?”
3  —  “What happens when a black hole evaporates?”
4  —  “Would an ordinary black hole attract antimatter?”
5  —  “Could you kill an ordinary black hole by feeding it antimatter?”
6  —  “What is the morphology of a black hole?”

Also, @mattbrowne asked What exactly happens when a (hypothetical) antimatter black hole merges with a ‘normal’ black hole? shortly before I arrived here. That excellent question deserves to be part of the series. Feel free to add any other notable black hole questions from whatever date.