(URF) Distortion Boots Make Flash and Teleport Both go on a 15 Second Cooldown

I think this a bug because Distortion Boots make Flash and Teleport go on the same 15 second cooldown, this is shorter than some champion ultimate's. I don't have any screenshots because it takes forever to get into the PBE about 2 hours but I did play some urf about 3 or 4 games and I tried distortion boots and it worked. I used flash to get to my lane faster when teleport was on cooldown.
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