same with me,
I always get the "Spotlight quit unexpectedly" message and my last app development cannot be executed via simulator. (
(other apps I developed are running in the simulator but I also get the "Spotlight quit unexpectedly" message there.)
disabling the applications check in Spotlight also does not help
IMac (2020) with macOS Catalina 10.15.7, Xcode version 12.0.1