The bundle is shared beforehand but they shouldn’t discuss with others.
The point being that you shouldn’t collide with others or change your testimony according to others.
By the time the bundle is prepared all witness statements will have been taken and signed off on by witnesses so you can’t really amend yours after seeing the bundle.
You are still not allowed to discuss what you see in the bundle with others.
worth also remembering that the bundle is now 1700 pages long — originally 700. It’s unlikely the majority will have studies it beyond the most relevant to them.
I think LM has been the only one who has studies the majority of it.