Any archive page with a category and a tag returns a 404, for example: https://lespetitsproducteurs.be/categorie/recettes/etiquette/amande/

While archive page with category only works fine: https://lespetitsproducteurs.be/categorie/recettes/

Even weirder, the dev website (on the same server, with the same htaccess) works fine: https://dev.lespetitsproducteurs.be/categorie/recettes/etiquette/amande/

What’s wrong with my production site?

Thanks for your help,
François