Stardew Valley (GOG) not recognizing Steam Deck controls as Gamepad

Hi, I have Stardew Valley (GOG version) installed on my Steam Deck via Heroic. So far I've only launched it while docked to my TV and an external controller connected to it. This has worked seamlessly. Last night I tried launching it in handheld mode for the first time, but while it is playable, the built-in controls are recognized as kb/m instead of gamepad. I have a community controller config downloaded for this game, but I've tried with several controller configurations including the defaults, but no luck. Forcing gamepad detection from within the game does allow me to navigate with the D-pad, but otherwise it doesn't match the custom community config I've got downloaded.

Has anyone had this issue or something similar? Any tips for fixing it?
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