If a player join the crawling mode while sneaking and start walking through a 1x1 tunel, the sensors doesn't detect the player movement (even if you not hold shift).
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Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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Likely caused by MCPE-166565.