https://wccftech.com/windows-10-insider-cumulative-update-build-21301-1010-kb5000626/

Windows 10 Insider Cumulative Update Build 21301.1010 (KB5000626) is now available for Windows Insiders in the Dev Channel. This is a small update that does not include anything new and is designed to test the servicing pipeline, Microsoft's Windows development team wrote. The release notes for KB5000626 include the following added known issue:

[ADDED 2/1] Some Insiders have reported that their PC experiences PC an IRQL_NOT_LESS_OR_EQUAL bugcheck when attempting to upgrade to Build 21301. We are working on a fix and will let you know when it’s included in an upcoming flight.