Jumping at the edge of wool blocks causes vibrations to the Warden and Sculk Sensors.

If you're not sneaking, jumping at the edge of a wool block causes vibrations. Normally jumping on wool blocks doesn't do that. Walking on the edge of a wool block doesn't do that either. You're either jumping on a wool block which doesn't normally cause vibrations, or you're jumping on air which also shouldn't cause vibrations. This can make jumping onto wool block dangerous.