Missing VAT ID field in checkout and email since version 5.3.08

Hi,

I've today noticed a critical issue with the VAT ID field (in my case, labeled "NIP") in the checkout process and order confirmation emails.

• In version 5.3.02, everything worked fine – the VAT ID field was visible at checkout and included in the order emails.

• After updating to version 5.3.08, the VAT ID field disappeared from the checkout and is no longer included in the email.

• I’ve updated the plugin to the latest version, 5.3.10, but the issue persists.

• I tested this thoroughly in a staging environment:

  • With version 5.3.02 active – the VAT ID field is present.

  • Switching to version 5.3.08 – the field disappears.

  • Switching back to 5.3.02 – the field returns.

All settings related to registration and billing fields are correctly configured. This issue is clearly related to changes introduced in the plugin starting from version 5.3.08.

Unfortunately, I can't revert to the older version on the production site because the newer versions support minimum order quantities per product variation, while version 5.3.02 only supports it per product – and I absolutely need the variation-level functionality.

Please investigate and fix this as soon as possible – the missing field makes it very difficult to issue proper invoices and manage B2B orders.

Thank you!

Hi, I’ve added your code to the production version. The VAT ID field does indeed show up in the checkout now, but for some reason, it appears four times — seemingly as many times as I have languages set up — even though the labels are correctly translated to "VAT ID" and when I switch languages, it still shows "VAT ID" four times.

Additionally, I noticed that on the test site you installed version 5.3.25, whereas I have version 5.3.10 as the latest available for download.

Can you tell me why this field is now showing up four times?