When creating item sets, items do not show correct map restrictions

I played league on and off for a while and have only recently started playing more often. Because of this new items were introduced that I know nothing about. I like to have an item set that it a general purpose set of items. I know these are all by far the most common so it's an easy way to filter out items that are simply never bought (ie. mejais). Anyways I went back to rework my item set and realized that some items don't have the correct map restrictions on them. In fact the biggest, and most obvious, flaw is that there is not a single item listed that mentions it isn't available on Summoner's Rift. With that alone you could easily assume that literally every item in the game is available on Summoner's Rift, which is obviously not true at all. Some items, such as the map specific ones, should probably simply state the one map it is available on instead of listing all the maps it isn't on.