ACT: Unforseen Consequences
PART: Diagonal elevator with headcrab event (this part)
ISSUE: If you die during this part the first time, the auto-save loads again at the top of the elevator. When you start the elevator a second time, the headcrabs don’t fall.
REPRODUCTION: Simply play it, die (I did it by sliding down the shaft into the electrified water), and then let the auto-save load you to the spot just before you press the elevator button to go down.
I don’t have the information you want for bug reports of these types because I’m at work. I will post that information when I get home, if it is necessary.