can't select iOS 14.0 as extension deployment target?

I want to set the minimum deployment target for my app's widget extension to 14.0, but that option is not available in the project settings.

The available versions are: 14.4, 14.3, 14.1, 13.6, 13.4, 13.2, 13.0, ...

Is there a reason it isn't supported?

see https://stackoverflow.com/questions/66131116/cannot-select-ios-14-0-on-widget-extension-deployment-target
can't select iOS 14.0 as extension deployment target?
 
 
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