I'm also getting error for AVCapturePhotoSettings.availablePreviewPhotoPixelFormatTypes in Xcode 12 final version. This will be solved in new update only, right? (I guess) Does anyone know how much time will Apple take to solve this issue ? (With their past experience)

Same issue here. Apple is going crazy day-by-day by giving such buggy updates.

It is mentioned in release notes that IBDesignable is being removed so I'm assuming IBInspectable might also have been removed with that too maybe. But not sure if that's the case. Link to release notes

Did you find any way to know in iOS Safari extension?