I am in France and it seems Visa Premier and Mastercard Gold with payments deferred to the end of month - with zero interest - are now considered "credit cards"

I am in France and it seems Visa Premier and Mastercard Gold with payments deferred to the end of month - with zero interest - are now considered "credit cards" (because they can be regarded as a limited form of credit, I suppose). I have a small "CREDIT" label next to the chip of my new card and airlines (EasyJet, Ryanair...) now reject my card if I select the cheaper "Debit card" payment option.