Upon reentering a world I had been in only a few hours ago, I noticed that a bunch of blocks have disappeared. These were not blocks that had been placed when I was last in the world, although I had been working in close proximity to the missing blocks. I had placed some scaffolding in the area, which has also disappeared (and my inventory is reduced, reflecting that I had placed the scaffolding when I was in the world a few hours ago). In the attached screenshot, the oak planks were previously filled in all the way to the stone wall, the oak logs were complete between the chiseled stone bricks, and there was a lantern hanging in the same position as the other two pictured, but it was beneath the oak logs that have disappeared. These missing blocks are in addition to the scaffolding that is missing (it was placed on top of the oak planks).