Flight of Gaavanir stops working. I cannot purposely reproduce it, but it happens on story mode prey hunts. Thy only way to fix the ability is to exit and restart.
The hotkey lights up when you press the corresponding button, but the ability does not fire. I can assign a different ability to the same hotkey and it works fine, but if I try to put Flight of Gaavanir back on that hotkey it still will not work.
I do know that the times that it fails to work I am on a story mission to hunt my prey and have recently interacted with the selection menu to advance the hunt and select my prey's weakness/strength/etc, but exactly at what point it breaks I am not sure.