If you put a map into an Item Frame and look at it from the back (e.g. glass or a fence post), the map is invisible. I don't wand the map to be shown on the back side as well, but maybe at least something like the paintings have.
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Considering item frames don't become transparent on the backside normally, this doesn't quite seem intended. Even paintings aren't invisible from behind and have a dedicated texture to ensure they aren't.
It also wasn't considered intended for torches to have an invisible underside.
I think is more of a feature suggestion than a bug but yes that would be nice.
There could be practical uses of the current state though.