When a piston or sticky piston head retracts in front of an observer, it sends out two redstone pulses instead of one.
MCPE-22046
Observer sends out two redstone pulses when a piston head retracts in front of it
Resolved
Duplicate
0
Thank you for your report. This issue was, however, submitted earlier as MCPE-20767. Please perform a search next time to make sure your bug hasn't already been reported.