@charger You're not the only one to use a Raspberry pi zero 2, and if "Recalbox 8 is not working on pi zero 2" was true, we wouldn't have release this version 
Unfortunately, the Raspberry pi zero 2 has only 512mb of RAM and we must pay attention to some details:
- Do not use a video output in 1080p. Forcing the 720p in the recalbox-user-config.txt is the best way to keep overall resolution "low"
- Disable the Webmanager (it takes too much ram for now)
- Keep the original recalbox theme
- Keep the number of active system low
- Do not use fullsets
You may also try to change your SD card, as they are often the root cause of several crashes and malfunctions.