'Position in Route = 0' visibility is not working as expected in a Form

Summary: 'Position in Route' used in a visibility condition in a Form is not working as expected.

Content (required): I added a text field in a form, and want the text to display when the activity is not-ordered (position in route = 0). I set the visibility of the text field to "Position in Route in 0" but the text is not displayed even when the activity is not ordered (position in route = 0). I replaced "Position in Route in 0" with "Position in Route is empty" but that doesn't work either.

Version (include the version you are using, if applicable): Preview Test instance 23B (with service update 8)