I am/have been struggling with trying to get the FastLED examples to work on ESP32-S2 and ESP32-S3 hardware. Using IDE 2.3.0 (and 2.2.1 before), the compiler produced many errors. After much searching, I found that the FastLED library in $home/Arduino/ was failing. Examining the library rabbit hole took me to $home/FastLED/src/platforms/avr/clockless_trinket.h which includes "avr/interrupt.h", which does not seem to exist in the path in the FastLED library.
Being a simple soul, to overcome the immediate problem, I commented out line 47 in $home/Arduino/FastLED/src/platforms.h viz:-
#else
// AVR platforms
//#include "platforms/avr/fastled_avr.h"
#endif
The examples now compile and run on the ESP32-S2 and ESP32-S3 platforms after adjusting the number of WS2812B's and the GPIO pin used.
I don't use the AVR platform in the current project so that is not a problem but I think this is a problem for users of AVR based systems. I could have copied avr/interrupt.h from somewhere else but I'm no AVR expert. I don't know, but it is possible this error does not happen in IDE 1.8.xx
Ideally, the FastLED maintainer should update the library.