Jum Jumington

Just tested it, yes it is still an issue. In one instance the chicken pressed itself into a corner which suffocated the zombie, in another instance the chicken rotated itself to face away from the wall without moving away from the wall, which placed the zombie in the wall enough to suffocate it.

I've seen this in a circuit I currently use. This is using a wooden button, however I have also seen this occur with a stone button. The sounds line up with the shorter pulse as well, playing the second "click" sound more quickly than usual. As for the length, hard to say, maybe describing the circuit path would be helpful? The signal travels through 5 meters of redstone wiring to activate a dispenser, then through a repeater set to a 3 tick delay to a falling edge detector using a repeater lock which powers the dispenser when the pulse ends. The pulse generated normally from either a stone or wooden button is long enough to activate the dispenser twice with that circuit. The shortened pulse is enough to make it through the 3 tick delay repeater and "charge" the falling edge detector but the pulse doesn't stay on long enough for the falling edge to activate the dispenser a second time. This has happened twice in the past 100 uses of the circuit.