On chunk borders, naturally spawning tress will stop generating at the border.
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Please provide the seed and the coordinates. In which version was the world created? This probably happened because a part of it was generated in an older version and the other chunk was generated in a new version, where the tree doesn't generate there.

Duplicate of MC-125007

I created this world the same day I took the screenshot in latest snapshot. the seed is 6377285600847177978.