Another thing I've noticed. I was joking with my LS Leader and wanted to see something so I created a seperate pearl for myself and had him kick me.
Little did I know that if you break a pearl and that person has a sack on them, it breaks the sack as well :p
Spent the next 30 or so minutes running around getting another pearl so I could rejoin the LS.
Did not test to see if it breaks the sack if you have the sack in storage and the pearl on you but I'm assuming it'll do the same thing.
Your Pearl will show as Broken once you've been kicked. Rejoining the LS will not fix the broken one, its garbage.