I can confirm this has happened to me several times with both trapdoors and falling sand. When you try to look around, you turn for a split-second and then the view resets to where you were looking when you got stuck. I can block with a shield and eat and use items but as I said, I can't turn to break the block I'm in and I also can't sneak. Playing on 1.14.2 PR4.
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I'm having this problem in the latest snapshot. Here I am breaking grass. The spikes correspond to each grass block broken.