Azalea Tree generation bug

Seed: 490798691970183764
X: 912, Y: 75, Z: -796

After going a few hundreds in the X asis within the specified seed, I stumbled upon this Azalea tree on the Snowy Taiga Biome.  Now, going straight to the point. After going a few google image searches and reading on the Minecraft Wiki, I found out that this tree commonly spawns above empty spaces and above lush caves. It says otherwise on the photo attached below. There was no cave below and it was not generated on an empty space.