The catch:
As a safeguard, the birthplace of passport holders from several Latin American nations would be scrutinized during the entry process to ensure that Chinese citizens still abide by requirements for entry according to the Act Governing Relations Between the People of the Taiwan Area and the Mainland Area (臺灣地區與大陸地區人民關係條例).
And it’s not just Chinese born foreigners who are affected.
Passport birthplace may also be used to deny visa-free entry to Belize, Saint Lucia, and Saint Kitts and Nevis passport holders born in Afghanistan, Pakistan, Nigeria, Libya, Iraq, Iran, Syria and Yemen.