Bug in the enchantment of Frost Walker 2 & 1

Bug in the enchantment of Frost Walker 2 & 1

I had a world full version 15w42a , when he went to the shapshot 15w43b the spell of frost walker did not work as it should . When walked on water ice melted very fast and there was not time to walk on water , and I say very quickly because it was beginning to walk and melted in seconds.

Please fix this bug .