Unable to complete chain quest Iceberg Inquiry

Chain is stopped at a quest “A Nose for News (Complete)”.

Mathias is not able to be found in Peyto where I can continue.

I have completed all story quest leading up to Yorn.

I have solved this by finding the abandoned quest from Sasha in Artherine. I wish there was an indicator where you can “pick up” abandoned quest mid way.