Hello.
I fired up theHunter: CotW and started out in New England Mountains. I decided to add the Gandhare Rifle to my loadout to replace my 7mm Magnum.
At first I didn't notice anything, but then I decided to use the flip up sight, but I kept hitting the scope keybind I have on my mouse and it didn't work.
At first I thought maybe the keybind had been deleted as that has happened in the past, but it worked with the other weapons. I tried several things like changing reserve, logging out to main menu, exiting to desktop.
It didn't work.
There is a solution to the problem though. I noticed that if you change the zeroing on the rifle the flip up sight suddenly works again.
So I don't know what causes the bug, but I can at least put out the solution that worked for me.