Radius Target Selector Argument Does Not Work

This Command: /testfor @p[r=5] Not work in Command Block
My device: Samsung Galaxy J5 (2015) Updated to Marshmallow
Snapdragon 410, Adreno 306, RAM 1,5 GB

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note by [Mojang] Mega_Spud (Jay Wells): This seems to affect mobile versions, and not Windows 10 PC.