Large trees may grow through dirt roofs. The roofs are 7 blocks high. I did this with oak trees in the plains biome.
To recreate;
1. make dirt roof
2. plant tree underneath the roof
3. chances are that a large tree will grow through the roof
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wobst.michael
@[Mod] Michael Wobst
Just reporting cuz its in the newest official version of Minecraft and it hasnt been fixed yet.
Duplicate of MC-15224. Please use the search function next time.