I was going to pose this as a question, but I think I’ve found a solution.
After completing a bunch of settings changes and installs halfway through the XR import video, I ran into some problems. I closed and reopened my project, and Unity Hub gave me a project versioning warning. I realized that somewhere along the line, the project version changed with the Practical Accessibility import (maybe?). Unity Hub showed that it was now a 2021.x version. At that point, I choose to open with the 2023. This is when the rest of the assets get wiped out (I think - I went through the same thing twice and didn’t take note of the exact sequence).
So, from what I’ve found as a solution is to first import Practical Accessibility, then force the version change to 2023.x, and then follow the rest of the steps.
