Unable to submit; date format error – Ninja Forms 3.6.9)

Some applicants are unable to submit forms because of an error saying “Please enter a valid date!”

The form is set up to automatically input the current date in YYYY/MM/DD format. Even selecting it in the pop up calendar in the field creates the same issue.

I was told at the end of March that Ninja Forms engineers were working on fixing it. In the meantime, it was recommended that I downgrade to Ninja Forms 3.6.7, which I have done for over a month.

When might we expect an update to repair this basic function?