What happens is that in my game of Zelda Links Awakening DX HD (the port for PC) it always happened that when I defeated the boss and grabbed the instrument the animation stayed on loop, what I did was close and open the game and it worked fine, the animation ended and took me out of the dungeon. But in this dungeon, the eagle tower, when I closed it and opened it (because the animation stayed on loop, as usual) and I grabbed the instrument again the door was closed, I tried to go back to the boss's room to see if it hadn't been saved that I killed it, but it wasn't,  I jumped where the door is and it wouldn't open.

I don't know if there's a way to fix it, the only option I can think of is to find a file of a game that is right after killing that boss and replace it with my game. I don't know if you could help me with that, anyway, I'm going to upload it to reddit, they always help there xd.