I'm not sure what I have missed in the new release, but I cannot set Standard Value in IB anymore like that I did for years.
The Standard Value is disabled in constraint dropdown list. If I clear the hardcoded value, "Standard" will appear but when I press ENTER, the old value comes back.
Is this a known bug or a new 'feature'?
I do not remember how older Xcode was working, but Xcode 13 does not permit us to set Standard unless the actual views are placed in the Standard position in the graphical editor.
Is this a known bug or a new 'feature'?
Not sure. But if you feel this new behavior is making your works difficult, you should better send a feedback to Apple.