I made three exact the same setups with a commandblock testing if a player is in range, see the picture. The only difference is the length of the redstone wire from the comparator clock to the command block. If the length is 1, the upper version, the contraption doesn't work.Only when the lever is switched the commandblock updates one time.
The other two contraptions are working just fine.
I've doesn't seem chunk or orientation dependent.
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Duplicate of [MC-11189]
This works as intended. For some reason, the comparator needs to be at least 3 redstone wires away to be detected as multiple pulses. Otherwise, it will not detect.
In the first setup, try moving the comparator one block forward (seeing from the image position). It will work, because it has three wires from the comparator to the block.

not "for some reason"
it does input - side input, what will result in 2 as it travels 3 block until it's there

Oh, that's right. I read that, but I forgot to change. 😉