https://www.bleepingcomputer.com/news/microsoft/microsoft-confirms-may-windows-10-updates-trigger-bitlocker-recovery/

​Microsoft has confirmed that some Windows 10 and Windows 10 Enterprise LTSC 2021 systems will boot into BitLocker recovery after installing the May 2025 security updates.

The BitLocker Windows security feature encrypts storage drives to prevent data theft, and Windows computers typically enter BitLocker recovery mode after events like TPM (Trusted Platform Module) updates or hardware changes to regain access to protected drives.