making blocks waterlogged through data packs no longer works

Starting in 18w07b, it was possible to add waterlog attributes to any blocks through a data pack. However, this no longer works beginning at 18w10d.
Here is a reddit post about it: https://www.reddit.com/r/Minecraft/comments/7xrxne/swimming_through_the_sky_in_18w07b_using_the/