Placement of a double tall grass / double fern in the same block where it was already placed will cause the disappearance of the upper part of the grass.
- Place the double tall grass on the grass block
- Try to place the same grass on the block where a double tall grass is already placed (in the lower part of the grass)
→ The upper part of the tall grass disappeared without particles nor sounds. If you are in Survival mode, the grass you tried to place will remain in inventory