When a player in the world flies, it will start an "infinite" spamming walking sound. The sound one can hear depends on what tile the player stands on. It disappears when he lands.

Seems like any air-time at all will enable this walking over gaps in the terrain etc... It happens for everyone in-game except the one that's flying.

For instance, if I stand on stone it will use the stone walking sound and the same on dirt.