Question Enemy spawns

I am just wondering why the enemies used to die and spawn randomly and now when they die and come back they are they exact same thing they were before??
Before:
say isla tormenta for an example gold room youd kill a seabeard and it either come back as a seabeard or a molusk
floatsms come back as spineskulls or floatsms

Now:
you kill a seabeard he spawns back as a seabeard
floatsm - floatsm
 
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