Summary:
The player cannot place a turtle egg (for example) on a block of foliage just like that, but if you place a turtle egg on any block and break this block (everything will hang in the air), and then place the foliage under the turtle egg, then it works. It also does not correspond to Java edition.

Steps to reproduce:

1. Place the foliage.
2. Try to place a turtle egg on it.
   ----> You cannot place the turtle egg on the foliage.
3. Replace the foliage with a full, solid block (for example, a stone block).
4. Place the turtle egg on it.
5. Replace the supporting block with a foliage block.

Observed results:
To place a turtle egg, the player needs a solid, block of suitable size.

Expected results:
To place the turtle egg, any block will be needed, since the turtle eggs do not need a supporting block.