It's not easy to reproduce, but while messing around with terrain noise and vertical/horizontal values, from time to time, I'd get a birch forest where the trees generated in a perfect grid. This only happens to birch tree generation.
MC-194487
Custom Worlds: Birch trees generate in a perfect grid when terrain noise is affected
Resolved
Duplicate
0
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However, we are already tracking this issue, and this report is a Duplicate of MC-194200, which is a report that has not been resolved yet.
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