[Donion] [2.0.41] sand-decal fully covered with concrete still plays sound when walked on

[Abkaal]

Sand-decal fully covered with concrete still produces its sound.

I expected a fully covered sand to not produce any sound aside from walking on covering concrete.

In the screenshot I uncovered some parts producing sound as an example.

Additionally the sound is identical to walking on mud. It might be intentional, but I found it a bit jarring, given sand-decals look dry.

Edit: All sand-decals that I found behaved this way.

Last version I played before current was 2.0.33 and I'm quite sure it wasn't the case back then.