Warden does not immediately prioritize mobs that attack it over mobs it has detected

The bug

The vast majority of mobs will prioritize an attacker over a mob it has merely sighted. Wardens, however, appear to lock on to targets it has detected even if another mob attacks it after the fact.

How to reproduce

A high Resistance effect is recommended as to survive attacks.

1. Spawn a warden

2. Aggravate the warden with three consecutive vibrations

3. Have a conveniently-placed skeleton behind said warden

4. Get the skeleton to shoot the warden during or after its roaring animation

Expected results

As the skeleton outright attacked the warden whereas the player only created vibrations, the warden should immediately change its focus to the skeleton and stop chasing the player until the skeleton is no more.

Actual results

This does not seem to happen always, and when it does, does not happen immediately.