It wasn't a large rollback, but enough for me to lose 3 stacks of gold bars (not blocks). I had needed to empty out my inventory to pick up some stuff on the floor of my vault to put into a chest, and it rolled back. I lost 3 stacks of gold bars (I had been planning to go to the market to buy some supplies like redstone and other building items, that's why I was carrying 3 stacks of gold bars). If this could be refunded, that'd be great. (3rd post about this, someone respond lol)