NoClip malfunction
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NoClip causes the player to stutter-step when walking into a block, but the player does not enter or pass through the block, whether on a server or in singleplayer.
Tested on 1.18.1
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It's a known issue, NoClip does not work on higher versions.
What you can do instead is use ClickTP plus freecam to teleport through walls, just click where you want to go.