This pack will save corpses of mobs some time after their death.

After first loading pack all mobs will be lying ~5 seconds after death.

Use: /trigger c.set_time set <time in ticks> to set time. (negative values)
If you set 20 or more(positive) then corpses will lying very long time. (~55 minutes of real time)
Example: /trigger c.set_time set -1200 will save corpses 1 minute.

Caution! Corpses can't be affected by commands. All already dead mobs are saving their time.
And you can't kill it. (What Is Dead May Never Die)
Only one command can kill dead mob (lol): /data merge entity <Autocomplete UUID by targeting on mob and press Tab> {DeathTime:0}