So I ran a scan thru the Preview app and after the scan it remembered what I had previously selected, did not remove any selections regardless if it was HD or SD, and even better, it did not automatically select anything.
Next I had two channels that had the single red dot. I selected those and updated the lineup. Went to the guide and verified the new channels were listed and waited for show info to populate. Went back and ran the scan again and there were no changes to the selections. Even the red dot channels still had checks.
Finally, I removed the check from my two always solid channels, which are HD, and updated the lineup. Verified they were removed from the lineup on the guide. Went back and ran the scan again. After it was complete, there was again no change to the selected. The two red dot channels were still selected. And the two HD channels I usually have checked did not have the checks on them.
Hopefully someone else who has the Preview app can test and see what results they get. At this point I’m wondering if this is a bug (which I don’t mind since it is not changing my selections) or an unrealized fix to the retain selected channels after a scan feature request.
I am testing this on a Gen 2 Fire TV Stick. The Tablo Preview app version is 1.4. Tablo is original 2 tuner and running firmware 2.2.22(1820613).