Have searched, but can't seem to find this same bug, but please tie up to another if there is already one the same listed!

When exiting game in usual steps (pause button > Quit to Title), and returning to game later in day, all progress (a LOT of placed blocks) had been lost, but usage of tools was the same i.e. it showed all the use the diamond pickaxe from mining, but none of the new structures built were there.