Ultimate hat not working on Teemo

Well basically I tried {{champion:17}} with ultimate hat to make a huge minefield (or well that was the idea), however when you get to practice the max CDR and 15% Ultimate CDR doesnt work on the shroom generation, only in the placement, so it doesnt really "reduces" his ultimate, because the placement itself its static , please make it work? Seems to me that besides form changing champs, teemo is the only one with this issue :(
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