Sculk cannot replace certain blocks

Sculk blocks spreading from a Sculk Catalyst cannot replace certain blocks

Steps to reproduce:

1. Create a world with the Vanilla Experiments toggle enabled
2. Place some Gravel and place a Sculk Catalyst on top of it
3. Kill some entities near the Sculk Catalyst

Expected result:
Sculk blocks should replace Gravel

Observed result:
Gravel doesn't get replaced by Sculk blocks.

Affected Blocks
Colored variant of terracotta Fixed
Gravel, sand, red sand Fixed
Tuff, smooth basalt, calcite, and dripstone block (MCPE-149554) Fixed
Podzol, mycelium, and rooted dirt (MCPE-150601) Fixed
Sandstone and red sandstone (MCPE-150602) Fixed