When grass or mycelium grows under powder snow the grass is not snowy

When powdered snow is placed on a grass block, the grass block turns into a snowy version. However, When it spreads, this is not the case. Note: Also happens with Mycelium.

Steps to Reproduce

1. Place powdered snow on top of dirt near grass blocks

2. Increase the tick speed to 1000
   ❌ The grass grows to under the powdered snow but isn't snowy.