When actively spamming the Shift key, there will be no footstep sound, only a micro-micro quiet sound of one breath tick (female skins don't even have this). This creates a huge imbalance during matches, and on top of that, it barely reduces speed.
#Silent footsteps
marsh shale
amber rune
Technically, It's not a bug, Is an issue of running animation Itself, the footstep sound event in frames are just located further in animation timeline. Fixers then need to interrupt overall running animations files (But because of how Croteam staff loves animating humanoid creatures, we should just forget about this issue). For me, they should just add a sound of how players starting to move/run/sprint, not only include footsteps in these states.