Registry Entries Reverting - Windows Speculative Execution Configuration Check

Question

My VM team has run into a wall remediating a vulnerability for Windows Speculative Execution Configuration Check. After applying the fix to the registry to correct, we found that the registry entries kept reverting after the server reboots. We validated that there's no GPO in place causing the reversion. We tried going through Powershell instead of the GUI to make the change, per suggestion from an article in the Tenable community https://community.tenable.com/s/question/0D53a00007kEGQXCA4/windows-speculative-execution-configuration-check. Is there a known other cause of the reversion or another known way to correct?