I had placed a shulker box on the ground, and at the same time minecraft had an update. I returned to my game to find the shulker box that I had placed on the ground had been deleted.
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The game force closed. After update was complete I returned to find the shulker gone from where I placed it.

We're tracking this issue at MCPE-62944, so I will resolve and link this ticket as a duplicate.
Did you exit your world by pressing the "Save & Quit" button, or was the game force closed?