Mo. Rev. Stat. § 513.515: If another homestead is acquired prior homestead is liable for debt.

Whenever any person shall acquire another homestead in the manner provided in section 513.510, the prior homestead shall thereupon be liable for his debts, but such other homestead shall not be liable for causes of action against him to which such prior homestead would not have been liable; provided, that such other homestead shall have been acquired with the consideration derived from the sale or other disposition of such prior homestead, or with other means not derived from the property of such person.