Look at the fourth one on the bottom, you can see the black splotches. It's not the best example I've seen, a quick search turned up this better example, notice how the edges become all dark:
https://forum.shotcut.org/uploads/default/original/2X/e/edb3...
Rust moves aren't quite the same as C++ moves, you can think of them more like a memcpy where the destructor (if there is one) doesn't get run on the original location. This means you can move an immutable object, the object itself doesn't have to do anything to be moved.
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