stand anywhere on flat land, dig 2 blocks down, and place an ice block in the hole. Now start to walk around the edge. Notice the speed at which you are walking. It's like you are crouching and walking, but you're not crouching at all. I'm a map maker and I noticed this while making a new map.
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This bug report duplicates MCPE-13852
Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 5.1.1 McPE 0.15.1 singleplayer creative. Also affects packed ice. Does not affect soul sand. Also affects ice/packed ice that is more than 1 block below the ledge the player is walking on: tested at 2 and 3 block above.