So with the screenshot below the slab behind the Sticky Piston which has an active Redstone dust on it will not work as it should. What should be happening is the sticky piston in this form should be Extended not Retracted Dont know if this a a bug or a different way redstone works on Bedrock Versions of the game but an update on this will be great.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-16131.
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Look, this is intended behavior. And it's not working different, redstone dust on slabs NEVER powered the block next to it. You must use full (and non transparent) blocks.