As you can see here, Haven C site in pre-release (I didn't play in beta so I'm not sure), had a grass floor. However, despite having a concrete floor now, the footstep sounds in C site is still grass. This can become confusing in many situations. When defending C behind boxes, you're not sure when enemy is in site or in C long. When in garage, footsteps outside double doors can sometimes be confused with footsteps in site given how bad directionality already is.