Note: I tried my best to search this issue and was unable to find one, I apologies if this is a duplicate.
Observers moved by pistons, activated by a 1 tick pulse don’t update Redstone properly. They seem to not power the redstone, under certain circumstances.
How to reproduce: Place a piston, with a Observer on its face, and connect the output of the observer to the piston. After updating the observer, or powering and de powering the Piston, it will creat a Redstone clock. Notice how the Redstone not visually powered but it’s still creates a clock. Any(as far as I can tell) Redstone components will be powered when connected to the Redstone powering this circuit, but will not when connected with a repeater or comparator. If you replace the observer with a redbone block, it will creat a Redstone clock with the exact same speed, but the Redstone is visually powered and will power other components.
This bug happens in Creative and Survival game Modes.
This is a strange bug and is tricky to explain, I also attached some screen shots and videos demonstrating this bug.
See attached screen shots for circuit that can be used to demonstrate this issue.
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(Tested before reported - from 'Technical Bugs List' https://docs.google.com/document/d/1nziKYzCr4pBdCRj2gIMlfr9MVdWHd6HyafdiBHx9F0c/edit)
This issue happens in 1.14.30 hotfix and 1.15.0.51 also.
This is most likely because of bedrock's ctick/ptick system, where different components are activated in different gameticks. The observer powers certain types of components such as pistons, which then cuts the signal off before it can power repeaters and stuff.
In my opinion this isn't a bug. The observer shouldn't power certain components because it's retracted before it has the chance. Fixing this would fundementally change how redstone works and probably break an incredible amount of stuff.
Thank you for your report!
However, this issue has been closed as Working as Intended.
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Still affects 1.12, and is definitely still an issue. Still waiting for any response from a moderator or bug tracker helper, this is definitely a bug and has been unnoticed for almost a month. I’m still unable to fine any duplicate of this issue or a similar one.