Your username: JeromeAlbert In which minigame/server does the bug occur: All three creatives Detailed description of bug: It lets you put a glitched piston out of your plot. I don't know how to explain it really but just watch the video...
It's not a glitch, since the slab is boundary end of the building/plot and start of the road, nothing is place able and breakable by hand
No, since you're not the block placer nor damager, and the piston head was considered a moving entity and caused a block update, the piston head became a solid block after it update, it's out of the boundary of the plot region, so basically you triggered an unbreakable entity outside your plot