Waterlogged blocks allow grass to grow underneath

See title.

Steps to reproduce:

1. /fill ~ ~1 ~ ~13 ~1 ~13 water
2. /fill ~ ~ ~ ~13 ~ ~13 blue_coral_plant
3. /fill ~ ~-1 ~ ~13 ~-1 ~13 dirt
4. /gamerule randomTickSpeed 1000
5. Make sure it's day (/time set 0)
6. /setblock ~ ~-1 ~ grass_block
7. Watch