Just found this thread, after I got a vCard sent to me, and could not find the contents after much head-scratching. Unbelievable that this bug is not fixed!! (Yes, I really think it must be a bug...)
Anyway, what worked for me, was to start the process of forwarding the SMS containing the vcard, it was then possible to edit it, and thus I found the "CELL"-entry inside it, and was able to write down the phone number there, which was what I was after... Cumbersome... but it worked for me.
(It doesn't seem to have been properly imported into any of the address books, I just got a new entry "Unnamed" every time I tapped the SMS to trigger the "vcard Imported successfully"-induced operation.)
J.