I'm having the same problem with PA losing Library info and having to manually rescan every time I restart my Galaxy Note 20 Ultra. I was having a similar problem with Locus Map Pro navigation app where I lost the ability to load maps that I had stored on my SD card. Locus explained that due to system changes in Android, I was no longer able to load maps that I had stored on my microSD card, and had to install a third party file manager (Total Commander and X-plor were tried) in order to see folders that were once accessible with the built in File Manager and had to make adjustments in the storage location of my maps. Locus Maps explained that in this post on their site. Maybe those Android system changes are also responsible for the problems we're having with PA?
