Thank you!
The json file is exact the same.
OK then, I guess it is my keyboard (GMMK Full Size, version 1) which is wonky with Android.
In UsbMode.apk those buttons are BUTTON_1, etc.
In Button Mapper though they are NUMPAD_1 etc, but I can't remap them there to output a keycode (yet).
I'll keep looking.
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