Rooted dirt doesn't replace red sand

The Bug

When an azalea tree generates on red sand it doesn't replace the surrounding red sand with rooted dirt

Reproduce

Seed: -6992212736716707601
Coordinates: /execute in minecraft:overworld run tp @s 3638.47 63.00 2032.98 240.60 24.00

Expected Result

The rooted dirt would replace the red sand