So you don't have a recent save before this occurred, that you can revert back to?
You could make a new save, and then send your runners out repeatedly until one of them comes back hurt, to see if that might trigger an update. If that doesn't help you may need to reload, and then save before using your runners each time until the alchemist gets unstuck.
A couple people have had problems with unresponsive NPCs, but I don't recall any trick to get them reset being mentioned...
Try emailing support@larian.com.
