Lineage-22.1-20250101-NIGHTLY-pro1 with December 5th security patch installed smoothly. I have not installed MindTheGapps 15 or rooted as I have been experimenting with using my Pro1 Google Free (well, Playstore system free) since my Pro1x is actually my daily driver (as a writer, I like the keyboard tweaks better on the Pro1x).
I did this using the update instructions for the first time. It worked beautifully, leaving all of my data intact. You are essentially doing an OTA update, except you have to do the update manually. The instructions are very clear and it's so nice not to have to