In 1.15 Pre-release 1, the Honey Block 'sliding' mechanic retained the player's sprint momentum.

As of 1.15 Pre-release 2 onwards, this sprint momentum is no longer retained. 

Current behaviour: A sprinting jump followed by the Honey Block's wall-slide immediately reduces player's momentum to 'walk' speed.

Expected behaviour: Honey block's wall-slide should retain player's sprint momentum, as it did in pre-release 1.

Demo: See the attached demo save. It is a void world with with a single jump that is easily doable in pre-release 1, but seems impossible in pre-release 2 onwards.