Hi
Its not a huge deal and I didn't even notice till I was plotting the map with c10t.
But Rubber trees seem to sometimes place in a regular grid pattern.
Here is the screenshot
[v1.43][BUG][Tweak] Rubber Tree Placement
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If i am not mistaken, rubber trees are placed on a per chunk basis during generation and they are placed in the center of the chunk. "Gridding" can occur if many rubber trees spawn in chunks close to each other. The possibility of this happening is greater in swamp biomes.
If that isn't the case then you are very lucky to find such a formation.
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Uranium, IC2 Tin, and IC2 Copper do this as well.
I last heard it was a forge issue, but I don't know if that's relevant anymore.