Sometime similar once happened to me, the moral is to not install the insiders version unless you have a legitimate reason to. Getting access to preview features before they’re ready on will get you in that kind of trouble.
Even better is/was the wording around insider installation, it said you can go back to normal windows, but left out the small detail that you have to reinstall normal windows from scratch vs rolling back.
More smiles and feelings! Thanks for contributing to the solution of this mornings problem :)