TAXES INCLUDED IN FORECLOSURE SUIT.
Tex. TAX Code § 33.42.
in effect(a) In a suit to foreclose a lien securing payment of its tax on real property, a taxing unit shall include all delinquent taxes due the unit on the property.
(b) If a taxing unit's tax on real property becomes delinquent after the unit files suit to foreclose a tax lien on the property but before entry of judgment, the court shall include the amount of the tax and any penalty and interest in its judgment.
(c) If a tax required by this section to be included in a suit is omitted from the judgment in the suit, the taxing unit may not enforce collection of the tax at a later time except as provided by Section 34.04 (c)(2).