@jonas
I have already gone through my library and removed all entries in the "Album Artist Sort" tag using a tagging tool to mass delete these entries.
The behaviour I saw was if there was an entry in the "Album Artist Sort" tag that did not agree with the "Album Artist" tag, the Sort tag was given priority when sorting the tracks. On my playlist I use the Album Artist tag to sort and do not have the Album Artist Sort tag displayed.
As for the second issue; https://forum.strawberrymusicplayer.org/topic/1431/album-synced-to-various-artists-folder-incorrectly
What was found in that issue strawberry was taking into account tracks that were not on the playlist when copying tracks over.