Yeah I agree, and it makes sense to require exact rule following.
However in this case neither I or anyone else knows what rule I have broken. I dont think I have broken any. If someone claims I have made a mistake here, they should at least tell me what mistake!
I removed the dashes and that did not change anything. And it does not make sense for that to cause Various Artists to change to John Williams. Maybe it could cause some issues, but if that would be the effect, it would definitely be a bug. And it would be easily fixable. Currently there is a “leak” in the system, some kind of leak, and it exists because the ways of it’s behaviour are not well enough known.
I did an abridged version of a plex dance I guess - quarantined my soundtracks folder with any actual “John Williams” material, changed the real compilation album tags directly in Plex to match what the id3 tags say aka “Various Artists” as album artist.
Then introduced the soundtracks back.
I can see some albums are already changing to non-tag info, single tracks off some albums appear as separate albums with the same name. Again tags are completely uniform within the albums. Only things that change are track name, track number, disc number if applicable.
At least this is more bearable for now than the john williams apocalypse-