Any prior right, easement, privilege, restriction or condition relative to a designated site which then becomes subject to an agricultural preservation restriction shall remain enforceable. The restriction shall be subject to the prior covenants except upon the express release of the covenants due to the acquisition of the site’s agricultural land development rights. If prior covenants are released upon the acquisition of the agricultural land development rights and the agricultural preservation restriction is then released pursuant to N.H. Rev. Stat. § 432:24 or N.H. Rev. Stat. § 432:25, the covenants shall be revived to the same status as prior to the acquisition of the development rights.