Merging with 2 different locations of 'Primary location for this contact'

Setup with 2 contact locations.
And having two duplicate contacts made of imported:
contact 1 has the primary location with 'Primary location for this contact' checked.
contact 2 has the additional location with 'Primary location for this contact' checked.

In finding duplicates the duplicate contacts can be merged.
Dont use merge all, but use merge 1 location to the other (empty) location.
It goes perfect, but look in the listings of contacts and there are two lines with the same contact id numbers. The browser (IE) gives an error in the page were the contact is shown.

I tested this on the test site and can reproduce it there. See
http://demo.civicrm.org/drupal/civicrm/contact/search/basic?q=civicrm/contact/search/basic&force=1&sortByCharacter=M
Name match test (id 749)

To create this:
I made 2 contacts (first name: test, last name: match) with the same email adress and the locations filled in as described. Then I merged these contacts and the result is on the listings page.

To solve this problem (by hand) you have to edit the contact and have to make 1 'Primary location for this contact'

Would be nice to have a warning and a choise in 'Primary location for this contact' when merging.