Double flowers are incorrectly replaced with snow layers by commands

Summary:

When some (double) plants are replaced with snow layers by commands, the plants are replaced incorrectly. The lower part is replaced with a layer of snow, and the upper part does not break automatically, but becomes invisible. In this case, the hitbox when hovering over the top of the plants will be as a complete block (including the bottom block of the snow layer).

• Tall Grass
• Large Fern
• Peony
• Rose Bush
• Lilac
• Sunflower

Steps to reproduce:

1. Place the indicated blocks.
2. Replace them with snow layers with the command (using the Y height of the bottom block).

Observed results:

The upper part did not break when replaced with a snow layer. From this, a large double hitbox is visible on hover. In this case, the upper part will still be invisible.

Expected results:

The plant will break completely.

Video:

Minecraft 2021-09-23 11-06-35.mp4