How to fix mandatory fields not working in Dawn Theme 8.0?

Hi everyone!

I recently updated my Dawn theme to the 8.0 version. However, as I had a custom text field at my product page and the mandatory fields are not working anymore. Now customers can send the product to the cart without adding any info. I have no idea how to fix it, as that was working perfectly on theme 6.0.

Here is my code:

Player Name:

Could anyone help me with that?

Thank you!

Any Luck? I am having same issue.