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Bug
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Resolution: Fixed
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Minecraft 1.13-pre3, Minecraft 1.13-pre4, Minecraft 1.13-pre5, Minecraft 1.13-pre6, Minecraft 1.13-pre7, Minecraft 1.13-pre8, Minecraft 1.13-pre9, Minecraft 1.13-pre10, Minecraft 1.13, Minecraft 18w30a, Minecraft 18w30b, Minecraft 18w31a, Minecraft 18w32a, Minecraft 18w33a, Minecraft 1.13.1-pre1, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 18w43a, Minecraft 18w43b, Minecraft 18w43c, Minecraft 18w47a, Minecraft 18w47b, Minecraft 19w08b, Minecraft 19w09a, Minecraft 19w11b, Minecraft 19w12b, Minecraft 19w13a, Minecraft 1.14.1, 21w15a, 1.17 Pre-release 1
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Community Consensus
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World generation
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Low
Forests (includes, forest, taiga, birch forest) are biased against spawning trees near the positive X and Z edges of the biome, while it does not hesitate to spawn trees beyond its edges in the negative X and Z edges.
This effect also applies to (suspected) all decorations, as seen in flowers in flower forests.
Positive Edge Examples:
1 860 100 730
1 1470 100 70
Negative Edge Examples:
-2116075216570249986 -310 100 -539 
-8754354938067898153 3800 100 5100
I must also mention that 1.12 and earlier seems to have issues with trees overstepping bounds in the negative directions, although it does not get as extreme as in 1.13.
