@jeremycloud have you found a solution for this?
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Filled a feedback to Apple - FB9016841
Same issue here. Adding button to navigation bar didn't work for me
It looks like to a Catalyst bug because it happens only when you drag a cell which is not visible on the screen and only on mac version of the app.
A workaround may be limiting the dragged cells by filtering them by the visible cells array of the tableview but of course this is not the expected behavior by the users.
Could you find any solution or a workaround to this problem?