Blender 2.9 - Smooth tool isn't working as before?

Hello, world!

I downloaded the newest version of Blender yesterday, 2.9 and so far it’s been great…until I tried to use the smooth tool in sculpt mode.
I’m making a low-poly skull and I wanted to smooth the edges of it and I couldn’t. I can smooth out everything but the edges of my mesh.
I am adding screenshots in case I’m not making much sense :slight_smile:

Anyone else noticed the same issue? Maybe there’s a new setting I could turn on/off?

Update: open the image in new tab to see the details