Grass + New water colors arent appearing

(This has occurred on all 1.13 snapshots)

Every time I launch the 1.13 snapshots, the grass texture is replaced with a pink and black checkerboard box (purple and black in snowy biomes). When typing in "grass" in the creative inventory, 2 grass blocks show up instead.

Also, the new water colors dont appear (only color is this opaque blue).