My Mac Studios fans run while sleeping

Does the issue occur in Safe Mode? When you reinstalled macOS, did you do a clean installation, or did you preserve or restore your data before testing? If you restored your data before testing, you could try to isolate the issue by backing up all of your data, then performing a clean OS installation of macOS Ventura without restoring your data. If the issue still persists after doing a clean OS installation and setting the computer up like a brand new machine, then you can be confident it's not due to your specific software configuration. At that point, I would recommend researching the terminal command pmset to see if there is a power management setting that you can alter to prevent this from occurring. Might be related to the Power Nap settings. You should check out this similar question to see if you can find anything helpful. Good luck!