Issues with controller buttons (Legion L+R) working in Bazzite

I've been working on getting Bazzite set up on my Legion Go, and after a few attempts, I've finally got it installed. However, I've run into a couple of controller-related issues that I'm hoping someone here can help with.

First, when I load HHD, all the controller submenus are missing.

Second, and perhaps more importantly, when I'm in Gamescope, the Legion L+R buttons don't do anything. This means I'm forced to use the touchscreen to access Steam overlays.
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