Flying machines, vertical or horizontal do not work. The observer blocks are trying to fight over each other for which one was activated first.
Comments 2
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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We will need additional information to determine if this is actually a bug. First, please make sure that the flying machine you are trying to build is designed for the "bedrock" edition and is relatively recent (or they say what bedrock version they work on). There are many tutorials online that are specific to the Java version, or are outdated, though they may not say so. You can also link the source of your design, and upload a screenshot or video that shows the design as another way to provide more information.