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Bug
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Resolution: Invalid
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None
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Minecraft 1.12.2
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None
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`Windows 10 64-bit Java 8u144 64 bit
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Unconfirmed
A simple way to recreate this bug is by building the machine shown in the picture or video. One facing east or west, and one facing north or south. If it is facing north, south, or down it will spit its block out, but if it is facing east, west, or up it will not.
After more testing it seems that when facing East or West, the piston on the bottom in this design will activate at the same time as the top one and prevent it from being pulled by the slime block, I feel like this is how it is supposed to work. But the piston does not activate and is pulled by the slime block when facing north or south. I'm not sure if its a problem with pistons, slime blocks, or buttons.
The pictures below are of the machine in a North-South orientation and an East-West orientation after pressing the button one time.