World Terrain Alterations Lost

I have noticed that Windows Edition Beta has been freezing when I click "Quit to Title". I have been playing for several hours today and the last time I loaded my world I noticed that several features I worked on, ie: a fenced in 9x18 wheat field, an added overhang created over my hidey hole entrance, and two areas where I planted Sugar Cane were gone, as if never done. I also upgraded my map from 0/4 to 1/4 between starting these features and completing them. The really strange thing is although my game seemed to revert to an earlier state, my map remained upgraded to 1/4. Something effecting the terrain/blocks did not affect my inventory.