Grass and flowers generates on sand and gravel (after a while, it breaks)

What's happening.

When playing on a new seed or exploring never seen chunks grass, flowers genenerates on sand near bodies of water (e.g. Lakes, oceans, puddles, e.t.c.).

Backstory:

When I was playing on a new seed that I had created I was walking next to a lake and wondering how I got seeds and flowers in my inventory, then I saw in the distance that grass was generating on the sand and after a while popping of into seeds.

Steps to Reproduce:
1. Walk into never been explored chunks near lakes or bodies of water.
2. See grass generating on the sand.
3. Wait a while (5 minutes).
4. Grass breaks, and seed pops out.

Seed from @unknown

Seed: 826991526
Coordinates: /tp @s 47 63 32 -90 45