This has happened to me while mining for as long as I can remember (at least since A17). It's a bit hard to tell from the picture, but what's happened is the block deformation has messed up, such that I'm basically seeing through the world in the center area of the screen. Sometimes blocks I've mined won't disappear. It'll go away after I mine 1 (or occasionally a few) more blocks. I've never seen anyone else mention it, nor seen it happen to a youtuber (though they tend to cut out/montage mining) so I'm just curious if it's mostly just a me thing, or if it happens to other people as well.
I had a similar thing happen a couple days ago, where block appearance wasn't always updating right away when I was upgrading (which is a new one on me) until I'd upgraded one or more additional blocks.
Edit: I should note that this was in single player (I only play single player) so it shouldn't be any sort of desync issue or anything.
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