Grass Blocks Don't Turn to Dirt Under Water

Summary:
According to the the wiki: "Grass will die and change to dirt after a random time if directly covered by an opaque block or water."
This isn't happening on the bedrock version; the grass remains unchanged.

Steps to Reproduce:

1. Place a bucket of water on grass
   OR
2. Place a grass block underwater

Observed Results:
The grass doesn't die and turn to dirt

Expected Results:
The grass blocks should turn to dirt

Screenshots/Videos attached: Yes

Notes: