When I first started making a flying machine in Bedrock Edition there were some huge problems because they were going in directions that one of the observers was not detected in, and this is also the case in New Nintendo 3DS Edition
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Redstone mechanics in the Bedrock and Pocket Edition versions of the game are entirely different from the Java version, because of this it is highly possible that the design you are using isn't going to work and needs to be converted so that it will.