Strange breeding bug

I chose to make a Terror Wight using a known breeding combination, but the game told me the egg was a Paranormal Slime. It was a Terror Wight.

Was the egg also called a “Paranormal Slime Egg” in your inventory, or was it only called that during the actual breeding process?

No, it was a Terror Wight egg, but I forgot to say that I had a Paranormal Slime egg in my inventory from an earlier breeding.