1.52 No proposed amendment to this Ordinance which has been unfavorably acted upon by the City Council shall be considered on its merits within two years after the date of such unfavorable action unless such an amendment is recommended in the report which the Planning Board is required to make to the City Council. The granting of "leave to withdraw" after a proposed amendment has been advertised for a hearing before the City Council shall be considered as constituting unfavorable action. Failure of the City Council to take action on a petition for a zoning amendment within ninety (90) days after the Planning Board's hearing on said petition shall render the petition inactive. Such failure to act shall not be considered unfavorable action but shall require another Planning Board public hearing, in accordance with the requirements of Section 5, Chapter 40A, G.L., prior to any subsequent City Council action on the petition.