Flowing water/lava can partially replace plants in lush caves (during generation)

Summary:
Flowing water/lava can partially replace plants in lush caves. In this case, the plant (often Big Dripleaf and Small Dripleaf) will stand on the flowing water/lava, and will not break.

Examples:

Seed: 1792249514
Coordinates: 3838 -17 968

Steps to reproduce:

1. Create a world with the specified seed.
2. Visit the specified coordinates.
3. Consider generating all nearby plants in the water/lava.

Observed results:
Plants (Big Dripleaf and Small Dripleaf) that stand where water/lava flows will be half broken. Blocks of plants where water/lava flows will simply be removed.

Expected results:
Flowing water/lava will not remove plant blocks (Big Dripleaf and Small Dripleaf). And the plants will not be partially broken.

Image: