Put these two commands in a command block chain set to repeat every tick.
execute as @a[y_rotation=-360..-180] at @s run tp @s ~ ~ ~ ~360 ~
execute as @a[y_rotation=180..360] at @s run tp @s ~ ~ ~ ~-360 ~Turn on the chain and look around. Notice how the player arm flicks back into position every so often. There is no jittering effect in f5 mode.
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pokechu22
migrated
This is MC-120545, which existed in prior versions (they fixed MC-4686 but not that). I've updated that ticket to include that 18w44a is affected; I probably should have done so earlier but I'm a bit behind on testing.