If you do /effect 1 1000000 (or any number for that matter) 127 for speed 127, and stand up against a wall, you can see through it. Tested with quake pro fov and normal but, this only happened with quake pro.
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Duplicate of MC-11684, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.