rolls eyes, Yeah, Blizzard wants you to solo the Rares and Bosses in the zone…
Any “bug list” posted would be incomplete, but you can try googling it as people have been compiling them
This was posted on Icey Veins
https://www.icy-veins.com/forums/topic/54477-a-workaround-for-phasing-issues-in-shadowlands/
Then there is this, from a Blue…
https://us.forums.blizzard.com/en/wow/t/grouping-in-the-shadowlands/736070