I think that some of the confusion may creep into the Yugo post war M48 being WW2 because Yugoslavia also refurbished WW2 K98s, post WW2, and not everyone knows/is aware of the difference between the 2. Didn't some M48s use up some left over WW2 parts which adds to the confusion even further? Post war Yugo made military kit often seems, to me, to be well made but massively under valued by people in general.
When it explicitly says 'M48A' on the receiver, there's no room for confusion...