Passenger riding on a mob has a delay before it falls when the mob is killed

The Bug

Passenger riding on a mob has a delay before it falls when the mob is killed. This can be easily seen with Baby Striders on top of adults.

Steps to Reproduce

• Summon a baby strider riding an adult strider.

  /summon minecraft:strider ~ ~ ~ {Passengers:[{id:"minecraft:strider",Age:-25000}]}
  

• Kill the adult strider and watch the baby strider closely as you do this.
• Take note as to whether or not baby striders riding adults striders have a delay before they're dismounted after the adult is killed.

Observed Behavior

Passengers riding mobs have a delay before they're dismounted after the mob is killed.

Expected Behavior

Passengers riding mobs would be instantly dismounted after the mob is killed.

Code Analysis

Code analysis by [Mod] Avoma can be found in this comment.