Duplication of observers and red stone lamps (Ghost Blocks)

Hi.

When trying to make a slime elevator, I made a mistake and then it started spewing out observers and red stone lamps. I don't know how it is doing it, but I believe it is from the slime block at the front of the machine. If you want to replicate it, I recommend you add the two observers under the piston and the slime block at the end to start the clock.

Thanks, please let me know if you need more information. 🙂

(Also it works better between two chunk and works in 1.12.2 pre-release )