+1, I have been experiencing this issue on PS5 since release. I was playing split screen co-op with my girlfriend and decided we liked taking turns in single-player more. We put her character in Wither’s Wardrobe and took an Origin character for a dungeon or two. When we returned to take her character back out she would not follow any other party member. They will follow her just fine and everyone is “grouped” appropriately. It’s been frustrating to move her separately from everyone else and we’ve been hoping for a fix with every patch that’s come out.