Previews not supported for watchOS target Widget extension

I'm trying to add a watchOS app and watch widgets to an existing iOS project, similar to what's shown in wwdc2022-10050. The widget works fine when I select the iOS scheme, but when I switch over to the watchOS widget scheme, Xcode fails to generate a preview and gives this error. I'm not sure how to enable support for previews properly.

UnsupportedProductTypeError: Previews not supported for WeatherNewWidget Watch



Previews can be defined in applications, frameworks, Swift packages, or dynamic libraries



productType = com.apple.product-type.extensionkit-extension

buildable = WeatherNewWidget Watch.appex

Ah... I didn't even get the preview of the watch app to work properly.

Previews not supported for watchOS target Widget extension
 
 
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