Items not handled correctly with option Rollback::First.

[Kered13]

When a rollback frame comes in with an item event, that item event will be appended to the vector of items for that frame, when it should be ignored because it is a rollback frame.

Items are appended here. Notice that there is no check for the Rollback::First option, and no check if the item is part of a rollback frame or an original frame.

[hohav]

No longer an issue in latest main, because parsing no longer treats rollback frames specially. You'd instead use the new deduped_validity to iterate over only initial or final rollback frames.