what causes "Sketch needs 0 constraints"?

Dear Experts,

After reading these related topics:

https://community.plm.automation.siemens.com/t5/NX-Design-Forum/In-sketching-i-am-getting-sketch-needs-0-constraints-in-NX-what/m-p/476471

and

https://community.plm.automation.siemens.com/t5/NX-Design-Forum/Constraints-for-Sketch/td-p/405835

and

https://community.plm.automation.siemens.com/t5/NX-Design-Forum/overconstraining-in-sketch-II/m-p/469200/highlight/false#M20879

"sketch needs 0 constraints" message is still an unsolved problem to me.

See the following video.

I attached my simple prt file for you to comment.

Best Regards.