Usually, the fire casted by my caster is localized to one object (or somehow I did not notice it) and did not persist over 60 minutes (enough for a person to survive). I wonder if the code for magical fire is changed now, since when I try to burn my trash can, it quickly spread to the other objects and more long-lasting than I thought. Probably going to burn others now.
Edit: after testing by burning the furniture of my neighbor (the villareals), I managed to make two sims die, hugo and his daughter (a child). meanwhile, I try to burn the library, but the fire did not spread like in the villareal's house. In fact, it behaved like the old magical fire. So... I'm partly happy for the way to kill the children, and partly annoyed that I cannot burn the public facilities. I hope they patch this so that I can burn public facility.