While it is definitely disappointing to feel cheated out of that victory, there are two workaround to this issue that should allow you to progress without issues:
-If you are playing in multiplayer, try disconnecting the additional players just before slaying the boss. The additional players are what are causing the bug to occur.
-You can go to the top of the Right Region (Region 3) from the Sanctuary, then head to to very top of the shortcut. There is a puzzle section whose reward disables the wind effect on your character.