When the View Bobbing option is on and the player is walking into a block, the camera rises slightly. However, the hitbox of blocks stays the same, so it offsets.
E.g. in the attached image, I am presing W and looking at lower part of the orange concrete, but I am targeting the purple concrete behind (it has black border and when I left click, I break it instead of the orange concrete).
Steps to reproduce:
turn on View Bobbing in video settings
place two blocks on each other
walk towards them
keep pressing W and look on the border between them
their hitboxes are offset
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Duplicate of MC-159952.