I don't know if it's a bug or just because of my computer. At least some Redstone techniques no longer work that have to do with observers or pistons. So far I have noticed that the simple elevator with observers, adhering pistons and mucus does not work and when I power a sticky piston with an observer, the piston pulls back the block it has in front of it instead of letting it go. This means that i don't have 3 by 3 doors. I've already tried to reinstall Minecraft or play without a multiplayer account. It didn't work. The techniques in the attached Picture doesn't work either. The Piston doesn't stay with me above.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-36986.
That ticket has already been resolved, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Bedrock edition redstone is different then Java. It doesn't have things that were originally bugs - like 0-tick pistons you mention (sticky piston leaving block when powered by 0-tick) or quasi-connectivity. This is by design - developers don't want to move bugs in redstone into bedrock version.