When you rollback on a doc with attached objects, it doesn't work.
Typically a doc with rights.
How to reproduce :
1) Create a doc and add rights, save.
2) Modify several time your doc, save.
3) Modify rights again, save.
4) Rollback to version from step 1)
As you will see when checking rights, scroll-list value are not memorized and rights are borked.
That's a pretty common behaviour when using wiki and it's very blocking.