Thanks @mikrasya for documenting this. I have the same problem, but already have inverses set. Removing inverses didn't help either. (I've read that inverses aren't necessary when using iCloud, that they are automatically inferred). 🤷🏼‍♂️ I sent in a question to Developer Tech Support, and will repeat any solution here for you and the other five who've marked your posting with "Same Here".

I'm hunting the same bug. Didn't see it until recent versions of watchOS 9. I'll be sure to post something here if I figure it out.

Same. I implemented the Complication controller in the watch app, and set ClockKit Complication - Principal Class to $(PRODUCT_MODULE_NAME).ComplicationController in the app plist. It's never called.

You'll find many good quality mockups of older devices here, courtesy of Facebook https://design.facebook.com/toolsandresources/devices/

Same issue here. Same Xcode and OS versions, on M1. I tried removing and re-adding the package, but that didn't fix it.