Put the summary of the bug you're having here
What I expected to happen was...:
Trees would have all the leaves
What actually happened was...:
Only one side of the tree had leaves
Steps to Reproduce:
1. Make a world
2. look through the trees
3. some have missing leaves
Related issues
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[media]

that's a chunk error, they occure randomly, yours just hit the trees a bit

The terrain generation itself isn't cut off, only the trees are cut off. That's why I think this is a dupe of MC-15820.