Plague Tale Innocence on Steam Deck - controls problem

I'm trying to run Plague Tale Innocence on Steam Deck inside Heroic (via GOG). The in-game controls only partially work. The screen always shows the keyboard shortcuts instead of the controller keys when showing how to interact with game elements, and it always 'forgets' when i choose the controller in settings. So it shows 'E' to interact with the dog at the beginning but none of the steam deck controls do anything. Joysticks and Back controls working OK though. Any suggestions? I tried a few different Wine/Proton versions.

Also, following the FAQ guidelines I looked at installing Wine Dependencies. However, this seems to be complicated on Steam Deck by the readonly file system, so I didn't pursue this. Any advice appreciated.
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