[Experimental] Azalea roots can be generated without azalea trees

Summary:

The world may not generate an azalea tree, but the roots from the tree will be generated.

Seed and coordinates (1.17.30):

Seed: -1734889211
Coords: 117 67 -143

Seed and coordinates (1.17.40):

Seed: 47664
Coords: 8720 98 1815
Coords: 8599 94 1956
Coords: 545 73 4063

Steps to reproduce:

1. Create a new world with the specified seed ("Caves and Cliffs" enabled).
2. Visit the specified coordinates.

Observed results:

The roots from the azalea have been generated, but the azalea has not.

Expected results:

Roots will always be generated with azalea.

Image: