Looks like most things are back in the game and undeleted, except for (a) one void chest in a location that I walked by when they were removed, and (b) all the magic stuff (two tomes, one staff), that was in my inventory at the time. Oh, well. Stuff happens.
Random bonus side effect... I had a room full of plump helmets. The wet soil had disappeared w/ farming, but the mushrooms were still there. Touching one caused all of them to "pick themselves" in a chain reaction as they fell down one block.