I have the same issue and I didn't try siding with Mirage.
I haven't had that bug, even though I tried both paths, but in order to speak to Korg, you have to speak to Orgram after the battle. He'll make a comment about Korg being in the village, and then you'll be able to speak with him.
Orgram made that comment, and yet I also have the same issue with the journal and Korg not being anywhere.
If you let Vicoria die (she needs a certain Like level to join you), I believe it glitches Korg.
Vicoria's still alive in my case, and yet I also have the same issue.
Did Feliar also survive for you? If so, then I suppose it has some other trigger for getting glitched.
Everyone is alive and well for me too
Both of them alive and well.
