Is asymmetric passing beam mandatory?

Hello, I have searched in vain for a regulation that the passing light ZWINGEND is asymmetric. Historical vehicles or also motorcycles drive (first partly) with symmetrical light, exactly as often road cleaning vehicles etc. From my point of view, the asymmetry is a desired CAN regulation, but no regulation – or is there such a regulation? I ask because I move my RHD car “symmetrically” and thus also came through the TÜV – but how Does this look like it in other countries, e.g. the Czech Republic? Does anyone know reliably whether there are mandatory regulations here (Czech Republic) in this regard? Thank you in advance.