Nicodemus disappeared, is it bug?

Hi,
I started sidequest in merhojed where I should help with disease.
I visited brother Nicodemus, I was reading book(not really) and when he asked me about disease I said it’s plague.
Later, after reading it again i think is poisoning, so I was wrong.
I forgot details, but I think he asked me for help or something and I said no.
So he started preparing by himself, without my help. He said he will try cure villagers or something like that and I can only wait.
After few days I have new infos in quest list. I have to go to see brother Nicodemus. But his mark - grey shield, is nowhere on the map. Also I was looking for him and he is nowhere to found in the village(I checked all houses) or Sassau.
Is it bug?

OK, sorry for this. I found him. I had to go to quest list and see the map after pointing on this quest.
Anyway I have to go back to my old save. Wrong cure :frowning: