First of all I want to say that the Device is iphone 6s but there were no options for it.
The bug is when a sticky piston pushing and pulling another piston for a 0.1 second tick,t and when I power the second piston which supposedly will get powered when the first piston is extended, it doesn't always extend.
In the video, it took me about 5 tries to get the piston extending. It happens more with redstone torches and levers but less with redstone blocks.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-16371.
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