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.

@t9mike, How are you able to add the new sizes to the complication assets? The template in xCode 13 is not updates for the 41 and 45 sizes.