Event Location Tab: Second Email and Phone fields broken

In Event Management under the location tab when logged in with CiviEvent permissions, when you attempt to 'add' another email or phone number a second field is not created. When the 'add' button or 'Add another phone number' link is clicked a JS error is outputted.

ReferenceError: buildAdditionalBlocks is not defined

When you login with administrator privileges the extra email and phone field appear on load. When you try to add a second email or phone number the form only save one of the inputted values (the second inputted value).