Article 50 was untouched by the Digital Omnibus. The Code of Practice on marking and labelling finalised in June sets the expectation that metadata, watermarking and detection interfaces are combined, because metadata alone does not survive re-encoding. The AI Office's exclusive competence now also covers AI systems built on a GPAI model by the same provider.
What to do: implement provenance marking for generated media and text, add chatbot disclosures, audit your labelling against the code, and, if you supply a systemic-risk model, expect the AI Office to ask for the Model Report.