Destiny 2 on PC doesn't recognize any controller inputs from DualSense controller. DualShock 4 inputs are mapped just fine and work correctly. If enabling Steam input for DualSense, Destiny 2 treats it as an XBox controller and none of the icons are correct in-game.
Please add proper DualSense controller mapping into D2 on PC to support DualSense the same way the game currently supports DualShock 4.
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If you think that's bad, use a Nintendo Switch Pro Controller and have your mind blown. A and B are swapped and X and Y are swapped. Anyway, there is no official support for these buttons in this version of the game.