I doubt no one has reported this but i looked through all the posts referring to mobs and i couldn't find it

Procedure

Place 10 armorstands (this is needed to bring the entity total to a minimum of ten for the command to work)

run this command:

/execute as @e[c=10] as @e[c=10] run /summon cow 0 0 0 

This should summon 100 cows at 0 0 0

Observe behavior of cows

Expected result: cow explosion

Observed result: big mass of 100 cows drifts around slowly shooting out one cow at a time in a random direction 

This behavior started occurring after one of the 1.19 bugfixes

I use commands and i have needed to do something like this more than you would think and it is strange that i should have to wait upwards of a full minute for the animals to separate depending on how many i spawned in