I haven’t seen it, but I’m sure somewhere the Archbishops have condemned the litany of EU law which provides that in a conflict between EU and international law, EU law prevails.

See: Costa v ENEL
Kühne v Heitz
Micula v Romania
Vattenfall
Commission Decision SA40348 (Spain)

From Intertanko: International laws signed by the EU itself rank belong the EU treaties, and the CJEU reserves for itself the final authority to deliver binding rulings on the compatibility of EU law with... international law rights

Novel interpretations of the EU treaties will prevail over conflicting international law, and even carefully circumscribed exceptions to international law have been interpreted to ensure conformity with EU law, rather than the other way around.

It remains that international treaties must be interpreted in conformity with EU law and, where they are in conflict, EU law must prevail (Re CETA, opinion of AG Bot, para 153).

Is there a reason that we accord this basic right of sovereignty to the EU, but not ourselves?