Safe Mode lets Windows start with only essential drivers and services, allowing you to troubleshoot crashes, faulty drivers, ...
If Bluetooth driver is missing or gets removed after a Windows Update, add the legacy driver from the Device Manager, install the correct driver from your manufacturer, etc.
Windows 11 is adding Baseline Security Mode to block unsigned apps, services, and drivers by default, plus new consent prompts for sensitive access and bundled installs, with exceptions when needed ...