The core issue, I think, is that Apple has added some sort of iOS-only enforcement in which third-party app Quick Look extensions cannot be invoked when the file type is a system-provided UTI. Since iOS and macOS 27 introduced the Markdown UTI as a built-in type, third-party extensions have stopped working on iOS even though the system does not really provide a Quick Look extension for net.daringfireball.markdown and falls back to the public.text preview. Apple should remove that limitation and align the iOS behavior with macOS, in which if a third-party extension can preview a more specific type, it should be the one producing the preview (not a general system fallback extension). Feedback filed as FB24481377.

I had to re-create the post here to add some tags: https://developer.apple.com/forums/thread/843292 This one can be deleted.

Same issue here, the XL circular complication must have an image of 286px x 286px, but the image won't load: 2022-09-05 10:09:31.644747+0200 AirWeightWatchWidgetExtension[74587:12832418] [archiving] Widget archival failed due to image being too large [1] - (286, 286). Feedback ID: FB11453017

This seems to be the underlying issue: Xcode 14 removes HomeKit entitlement from Mac Catalyst builds (https://github.com/feedback-assistant/reports/issues/349).

macOS Ventura Beta 5 and this issue is not fixed…

So macOS Ventura Beta 4 and Xcode 14 Beta 4 are out and HomeKit apps do not work at all when built with them and nobody at Apple seems to care…