The bug

Taking any damage before fatal fall damage removes the attacker credited for kill, affecting death messages and statistics.

Steps to Reproduce

1) Take damage from a husk
2) Take any environmental damage (fire, magma block)
3) Fall off a high place
4) "Player was doomed to fall"

1) Take damage from a husk
2) Take minor fall damage (e.g fall 4 blocks)
3) Fall off a high place
4) "Player fell from a high place"

If you had replaced Step 3 with any other way of dying (e.g /kill) it would have shown the attacker (Husk) in the death message.