This issue doesn't occur after Mosaic 22.2.1.0.
The workaround is to create the person by accessing the Find Person screen from the People menu until you're able to upgrade to a version with the fix.
Unable to add new person from the Change button on personal relationships
In this article, we look at why adding a new person from the Change button in Personal Relationships fails when using the Find Person screen
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Written by Yusef Abulaynain
Updated over 5 months ago