Seems like even though we are in 2018 working on cutting edge tech stacks, but classic case of DLL Hell still exists and it exists so much, you had to invest every dime in troubleshooting each area of application but soon realise to restart it again.
I published my changes to the server, unfortunately, for some reason new code didn’t work (and yes, it worked on my machine!) Republished multiple times, checked database schema, permissions, connection, everything was in place. Finally, decided to shift existing pack on server and re instantiate again.
Whola, it worked like nothing happened!