Tex. Health & Safety Code § 775.228

The disannexation of territory from a district under this subchapter does not diminish or impair the rights of the holders of any outstanding and unpaid bonds, warrants, or other obligations of that district. Property disannexed under this subchapter is not released from its pro rata share of any of the district's bonded indebtedness on the date of the disannexation, and the district may continue to tax property in the disannexed territory until that debt is paid as if the territory had not been disannexed.