"Inverted burden of proof" widely exists in the field of labor law. Articles 6 and 39 of the Labor Dispute Mediation and Arbitration Law, Article 13 of the Supreme People's Court's Interpretation on Several Issues Concerning the Application of Laws in the Trial of Labor Dispute Cases, Article 6 of the Supreme People's Court's Provisions on Evidence in Civil Litigation, and Article 2 of the Notice of the Ministry of Labor and Social Security on Establishing Labor Relations all have provisions in this regard. Wage payment vouchers, social security records, recruitment registration forms, registration forms, attendance records, etc. The employer may be required to bear the burden of proof.
If you want to fully protect your legitimate rights and interests, I suggest you look at the Labor Law, the Labor Contract Law, and the Regulations on the Implementation of the Labor Contract Law, so that you can know in what ways the employer has violated your rights and interests and will benefit you for life.
If the employer infringes on your legitimate rights and interests, pay attention to collecting evidence. This is very important if there is arbitration or litigation in the future.