Azalea Trees Generate Too Often in Old-Growth Taigas

Azalea trees seem to generate slightly too often in old-growth pine and spruce taiga biomes.

I counted 16 trees in a single old-growth taiga in this seed: 

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In the attached screenshot, each of the circled diamond block pillars are on top of an azalea tree. There are 11 more azalea trees in the same biome.

/tp -1321 120 396