Redstone dust will float when placed on farmland.
make a 2 block hole with a daylight sensor at the bottom. Then till a dirt block next to the hole and put redstone dust on it. then get into the hole and you will see a 1 pixel gap between the dust and the block
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We're tracking this issue in MCPE-12109, so this ticket is being resolved and linked as a duplicate.
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Confirmed and happens in 1.17.40.20