I use Safari Version 15.2 (17612.3.6.1.6) on MacOS 12.1 (21C52) and haven't noticed this.
What versions are you on and are you on the most recent Zoom version?
December 27, 2021 version 5.9.1 (3506)
Resolved Issues
- Minor bug fixes
- Security enhancements
- Resolved an issue regarding the microphone light indicator being triggered when not in a meeting on macOS Monterrey
If you can reproduce this issue easily, which it seems you can, I would open a case with support about it.