I generated a new world and I spawned next to a forest, I turn around and see that some trees generated with coal ore instead of leaves.
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Please also force a crash by pressing F3 C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder]
) here.
Please provide seed and coordinates.