I’m getting the same thing and have to turn off my PC at the wall to get out of the black screen as it won’t let me alt f4. It only started happening yesterday and I didn’t change anything with my settings or PC prior to it happening.
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Had this issue to, though to save turning of the pc fully, you could try Ctrl alt delete and going into task manager and stopping destiny 2 there, doesn’t fix the game from not working but at-least you don’t have to shut down the pc