ISSUE
Attempting to play Enter the Gungeon with a Dualsense 5 controller using Steam Input on the current Steam Beta causes wrong inputs. L2 and R2 seem to map to the Create and Options buttons respectively, but occasionally you can see e.g. R2 shoot after coming out of the pause menu that wrongly appears as if it activates both R2 AND Options.

OS
Arch Linux, up to date as of Mon 28 July

STEPS
- Enable Steam Beta

- Launch Enter the Gungeon with Steam Input enabled for Dualsense 5 controllers

- To easily reproduce, adjust the default controls:
Options -> Controls -> Edit P1 Controller Bindings; then change Binding Preset to Flipped Triggers

- Return to the main menu and attempt to play the game

- After selecting a character, pull L2 and R2

RESULTS
L2 causes the Inventory to open (which "Create" / back is mapped to), while R2 causes the Pause Menu to open (as if "Options" / start has been pressed). Usually no dodge roll (L2) or gun firing (R2) takes place.

EXPECTED
L2 should perform a Dodge Roll, R2 should shoot, with no menu or inventory popups (that is, once you have started the game proper or got through enough of the tutorial to pick up a gun; while in the starting area R2 should do nothing but dodge rolling should still work with L2).

FURTHER NOTES
- Attempting to remap the controller in game doesn't seem to work either; even though the face buttons all seem to work in the menus etc. they cannot be remapped

- 2 controllers seem to be available game with only 1 physical controller connected

- Everything works as expected without the Steam Beta; I can't be sure exactly when the problem started but the Steam Beta itself was working when I last played it, I doubt more than a week ago.

- I don't believe it's an OS update that's caused the issue as I have no problems outside Steam, and it can be fixed by reverting to the regular, non Beta, Steam Client.

Finally, I apologise if there is a similar enough issue for this somewhere already, I had a look but couldn't find it... how anyone sorts through all these reports is beyond me!