After the date customer rate relief bonds are issued under this subchapter, if any provision in this title or portion of this title or related provisions in Title 9, Government Code, are held to be invalid or are invalidated, superseded, replaced, repealed, or expire for any reason, that occurrence does not affect the validity or continuation of this subchapter or any other provision of this title or related provisions in Title 9, Government Code, that are relevant to the issuance, administration, payment, retirement, or refunding of customer rate relief bonds or to any actions of a gas utility, its successors, an assignee, a collection agent, or a financing party, which shall remain in full force and effect.