I Found An Azalea Tree That Spawned Above A Large Spruce Tree

And The Rooted Dirt Spawned Below The Spruce Tree

Not Sure If It Will Do That With Other Trees, Also It Seems Pretty Rare To Happen

 21w39a

Seed: 5282330719287394633
/execute in minecraft:overworld run tp @s 1366 79 593 0.9 -15.9