The bug

All types of saplings can be placed on dirt, grass, and farmland. But not all of them can grow to trees on farmland.

Affected trees

Last updated for 1.11.2

• 2 × 2 spruce and jungle
• dark oak
• acacia

Code analysis

Based on 1.11.2 decompiled using MCP 9.35 rc1

The problem is that the blocks a tree can grow on are hardcoded and not retrieved from the sapling.