Circling back to this thread in case it comes up in a search... for now, at least, this seems to have been fixed/solved and if I log out, I can still see the full forum. Thanks to @Rob. S. for catching that this had changed.
Lineage-21-20240506-NIGHTLY-pro1x with Apr 5th security patch installed smoothly via OTA. MindTheGapps14, and root was maintained.
Done on the road in CO. 😉