Sometimes (very often) when growing a mangrove tree at negative height, leaves appear at zero height. You can use a flat world to easily reproduce the problem.
Steps to reproduce:
- Place the mangrove propagule at a negative height.
- Grow a tree out of it using bonemeal.
- Look at the leaves that formed at 0 height.
- If the leaves do not appear, repeat everything again.
When growing a mangrove tree at negative height, leaves appear at zero height.
Leaves should not appear above the tree.