When Running on Slime blocks pistons cant shoot you upwards on them

When testing around with some slimeblock launchers i found out that when running over slime block that are being pushed upwards by a piston you dont get launched as you would when standing still. this is also a problem when walking and has broken tons of slimeblock entrances, launchers etc.

Bug Report Video
(Reason : file too large)
https://youtu.be/YYP4e5VKTMY