I have this issue in Xcode 13.3 (13E113), but I was able to add one by spamming my mouse around different parts of that area.
I deleted the property and tried a few times to try to see if there was a particular spot to click, but it didn't seem like there was. Clicking once in any location doesn't seem to work, but just spamming the mouse and moving the cursor around the box eventually creates a new property.
austinbrrtt
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