Tex. Bus. Orgs. Code § 10.201

After a merger, interest exchange, or conversion is approved as provided by this code, and at any time before the merger, interest exchange, or conversion takes effect, the plan of merger, interest exchange, or conversion may be abandoned, subject to any contractual rights, by any of the domestic entities that are a party to the merger, interest exchange, or conversion, without action by the owners or members, under the procedures provided by the plan of merger, exchange, or conversion or, if no abandonment procedures are provided, in the manner determined by the governing authority.