This subtitle applies to all durable powers of attorney except:
(1) a power of attorney to the extent it is coupled with an interest in the subject of the power, including a power of attorney given to or for the benefit of a creditor in connection with a credit transaction;
(2) a medical power of attorney, as defined by Section 166.002, Health and Safety Code;
(3) a proxy or other delegation to exercise voting rights or management rights with respect to an entity; or
(4) a power of attorney created on a form prescribed by a government or governmental subdivision, agency, or instrumentality for a governmental purpose.