If you go up a hilly place, you cannot go forward as if you were blocked by a fence. It is also pushed out of the block.
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Duplicate of MC-188987

Problem appears to be with the upper soul sand block: to provide an example, the bug IS triggered by jumping from soul sand up to soul sand, soul soil up to soul sand, but the bug does not occur jumping from soul sand up to soul soil.
Yeah, seconding. To word it better, in the soul sand valley (but probably also any adjacent soul sand of different elevations) you're prevented from jumping up a block from one to the other, almost as if there's a border on the edge of the block. Sprinting sometimes gets you up top, but then you get pushed back a block or two back to the lower level.