Worked on a Realms creative world and built many things.  I went into the same Realms world 6 hours later and everything I did was gone.  My grandson went into his Realms world several hours later as well and also found out nothing was saving from his Realms world.  We are on Macminis and this only started happening today 6/26/2019.  We just had our game updated to 1.14.3 a day or so ago.  What should I do?