Can confirm.
If you're one of those weirdos who prefers to not be vulnerable to CVEs, and you've enabled the OPT-IN (🤔) fix that Microsoft released for CVE-2013-3900, you'll find that it's gone after upgrading to Win11.
EnableCertPaddingCheck is gone, along with the parent keys.
PSA: Upgrading to
#Windows11 wipes out security mitigations for CVE-2013-3900, meaning that if you upgrade you must re-apply said mitigations.