My $0.02, Xcode 13.4.1 (13F100):
When clicking on the text “Click here to add additional {document type | type identifier} properties”, nothing happens.
However, when clicking to the left of this text, below the disclosure triangle at “Additional …”, then a new row appears.
It's at least missing guidance, since the area is in no way highlighted. As it is, the UI requires you to be clairvoyant as to where “here” is.
bit-fu
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