large chunks of worlds are disappearing and worlds are breaking in 1.17.11, it has happened in multiple survival no cheats worlds over the last few days.  We are a team of two that were playing in these worlds and we have lost our builds, our RSS, including literal stacks of diamonds, Netherite equipment, Emeralds, Enchanted books and equipment, Eyes of ender... etc.  This is getting a bit much.  The work we put into these worlds and how far we got was amazing and we lost everything.