Ever since users installed the KB5011831 Windows 10 build they got an error code "0xC002001B" if they had Intel 11th Gen Tiger Lake chips, as well as 12th Gen Alder Lake CPUs. It was not just Chipzilla gear either, the bug hit Zen 3 Ryzen 5000 and the latest Zen 3+ Ryzen 6000 series CPUs

Microsoft has determined that the issue hit chips which supported the Intel Control-flow Enforcement Technology (CET) or the AMD equivalent Shadow Stack technology. CET helps to mitigate Return-oriented Programming (ROP) exploits or CALL/JMP-oriented programming (COP/JOP) exploits.

The Microsoft advisory says to download the OOB update KB5015020 which fixes this issue.