For some odd reason, when you take sticky piston with a block in front of it, and you fire a one-tick-pulse through it, it turns into a block that looks retracted, but a SECCOND head is coming out the front? And then, the piston doesn't respond to redstone whatsoever.
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However, this issue is a Duplicate of MC-122322.
It has been linked to this report. If you have additional information, please add it to that report.
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