What is the risk of defective titles or double registrations, and what if the seller says the restrictions don't apply?

The State Department's 2024 Investment Climate Statement warns that defects in titles and gaps in ownership in the public registry can lead to conflicting property claims, especially in rural areas,… and that enforcing eviction orders is difficult where ownership is in dispute;… the mitigation is to review the chain of title 10–20 years back. A commercial guide adds that if a seller asserts that the Art. 122/123 restrictions do not apply, independent legal verification must be obtained, since this is the main source of problems for foreign buyers.