When dynamic surroundings is installed, your footsteps are completely silent on top of the subterranean layered blocks, like layered dirt and layered gravel.

REPRODUCTION
Step 1: Install Subwild
Step 2: install dynamic surroundings
Step 3: find a cave and step on a layered block.

What version of Dynamic Surroundings are you using?

Hi !
You can fix this issue by adding these lines :
"subwild:dirt_patch": "dirt",
"subwild:mossy_dirt_patch": "leaves",
"subwild:podzol_patch": "dirt",
"subwild:gravel_patch": "gravel",
"subwild:sand_patch": "sand",
"subwild:red_sand_patch": "sand",
"subwild:snow_patch": "snow",
"subwild:ice_patch": "ice",

In the assets directory of dynamic surroundings (assets/dsurround/configs/mobeffects/footsteps.json)
Just open the dynamicsurroundings.jar with winRAR (or else), then open the footsteps.json file with Notepad++ and add the lines above under the "footsteps" part. For me, it was from line 102 to 109 (DynamicSurroundings-1.16.4-4.0.4.2 version)

Now every patch makes the right sounds. You're welcome.
Also, I don't recommend tweaking the mod files like this because it will be erased if you update the mod, the best thing you could do is creating a new issue on the dynamic surroundings github and ask the author to add these lines in his mod.