How can I set Power Source Features in the ZAP GUI? They're all disabled.

[JetForMe]

I wanted to enable battery SoC reporting in my device, so I created a Power Source endpoint, and enabled a few attributes. One of them, FeatureMap, needed to be set to indicate it has a battery. But the Features tab, which shows the four possible values, wouldn't let me adjust any of them. I tried all three storage configurations on FeatureMap (RAM, NVM, External).

I quit and relaunched the app, and the Events and Featuers tabs disappeared. I quit it again, deleted ~/.zap, and launched it again. This time it showed the tabs, and the Features tab showed Battery as enabled, because I had manually entered the value in the attribute list (which it warns me not to do). In any case, the UI was still disabled (you can't see it in the screenshot, but when I hover over the toggles, I get a cursor with a no-entry badge).

Seems very buggy, but maybe I'm missing something.