Command block target selector m=3 doesnt work

My Problem is that i want to distinguish the Player and the Spectators at my new map.

So i give alle non gamemode 3 persons a score.
like
scoreboard players set @a[m=!3] Test 1

but it seems that Minecraft has a problem with the Operator "!" in the target selector "m="

with a normal m=3 it works but not with the "!"

Please fix it because it's a nice little feature

-UNFORG3TTABLES

P.S.:Try /say @a[m=3] and /say @a[m=!3] then you see it works with one but not with the other