Saving a URL Link button on the Deal module.  The below fields used to save without issue at all, but now produce an error of "URL contains unsupported merge field!"

${Contacts.Mailing Street}

${Contacts.Mailing City}

${Contacts.Mailing State}

${Contacts.Mailing Zip}

${Contacts.Mailing Country}

In links that were saved previously that had these Merge Fields, they still resolve correctly when the button is pushed, so please advise why only the Save is producing the error