Microsoft has acknowledged what users have been reporting for several days. As it turns out, the Security update for Secure Boot DBX causes some computers to boot into BitLocker recovery.
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As it turned out, KB5012170 generates lots of headaches for customers. Besides the need to update UEFI to install updates, it causes multiple computers to boot into BitLocker recovery.
Microsoft has issued a warning about a Secure Boot DBX update failing to install on all supported client and server Windows versions. According to the documentation, a BIOS update might be necessary.
With Patch Tuesday recently, Microsoft released the KB5012170 update which adds new vulnerable UEFI signatures to the Secure Boot DBX. The newly added signatures are related to the GRUB vulnerability.