After a mob is launched by summoning many mobs together, they mass migrate to whence they came

I used /summon cow ~20 ~-1 ~20 in a superflat world in a repeating command block and all the cows that got launched out started walking back to the center.

 

It affects at least the following mobs:

• Bee
• Blaze
• Cat
• Chicken
• Cow
• creeper
• Evoker
• Ghast
• Goat
• Hoglin
• Husk
• Illusioner
• Mooshroom
• Ocelot
• Panda
• Parrot
• Pig
• Piglin
• Piglin Brute
• Pillager
• Polar Bear
• Sheep
• Skeleton
• Stray
• Strider
• Vindicator
• Villager
• Wandering Trader
• Warden
• Witch
• Wolf
• Zoglin
• Zombie
• Zombie Villager
• Zombified Piglin

It is very interesting to watch with witches because they drink a potion then start walking to the center