I am having the same problem.
In my case, I am being asked to edit screenshots even though the app does not contain code that supports Apple Watch or iMessage.
And editing iMessage screenshots has become a necessity.
The edit page for your app version also shows settings for App Watch, iMessage, and even App Clips.
I think the reason why these screenshots require editing is because there are supposed to be settings for App Watch and iMessage.
I'm guessing this problem can be solved by changing the settings to not use App Watch or iMessage, but I don't know where to set this.
Topic:
App Store Distribution & Marketing
SubTopic:
App Store Connect
Tags: