Validating field with regex when editing or creating a new adress in checkout

-- HikaShop version -- : 3.4.0 business
-- Joomla version -- : 3.8.6
-- PHP version -- : 7.1.14
-- Browser(s) name and version -- : Firefox 59.0.2 (64 bits)

Hi,
I found out that fields arent checked properly when user edit or create a new adress in the checkout view. An error message does appear if a mandatory field is left empty, but when the regex is not matched something is wrong (you can currently check on my site for the custom "SIRET" field, if you dont enter a 14 digit number, the form cant be validated but no message at all is displayed, and the "telephone number" field seems not to be validated at all, you can enter letters in it).

Those exact same fields works fine on the "create account" page, and error messages are displayed in both case (empty field or invalid field).

what to do about it ?