Tranzig missing (possible spoiler)

Apologies if this isn't posted in the right spot.

I have finished clearing out the Nashkel mines, and have talked to Ghastkill in Nashkel to get my reward. After reading the clue from Mulahey's lair I headed to Beregost to the Feldpost Inn but Tranzig isn't there (on the 2nd floor).
Did I miss a something? I thought just clearing out the mines and then talking to Ghastkill was all I had to do.
Can anyone advise?

Thanks.