This glitch basically entails that redstone dust doesn't redirect power how it should when next to a piston/sticky piston.
This bug can be reproduced by placing a line of redstone wire, and placing a block that needs power at the end. Then place a piston next to the redstone dust adjacent to the redstone component.
What I expected to happen:
The redstone dust should either property display that it is powering the piston and redstone component; or that the redstone lamp dhoush not receive power.
What happened:
The redstone dust redirected only to the piston, despite it still giving power to the component.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-16892.
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Can reproduce, Switch 1.5.0.14