Required fields are shown optional

Hi there,

since we made the latest Updates of WordPress and all Plugins we have following issue:

We defined a field “billing_address_2” to get the house number as an extra field. Since the update the field is shown as “optional” but it is defined as a required field. If you cache reload the checkout step-page then you can see that the red asterisk is shown for a millisecond, then disappears and “optional” is shown.

I just switched to storefront theme locally and the behaviour is the same.

Best regards

The page I need help with: [log in to see the link]