Wrong vCard Export on communication fields

There's an issue (2.2.2) with vcard exports. Basically the export runs fine exept for the fax. Let's imagine we've Mr X whose business phone number is 123 and has 456 as fax number. If I export to vCard, both are exported but (and usable by MS Outlook) but the fax number is exported as 'business number 2' and not as 'Business Fax'.

Strangest, on the sandbox (3), the behaviour is even worse. If you create a contact with:

1° Home Fax 123
2° Main Phone 456

The vCard only shows "Home as '123'". It means that 'main phone is skipped and 'home Fax' becomes 'Primary home' (tested with Outlook 2007). The unreliability of vCard export makes it unrelevant.