Place an upwards facing observer and then put a slab on it. After this, place another slab on that slab to turn it into a full block.
What should happen:
The observer detects the first slab being placed, but not the second.
What happens:
The observer detects the second slab.
Comments 5
They don't detect just what they can see. They detect every updates that occur to the block they're facing.
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Why shouldn't the observer detect the second slab? That doesn't make ANY sense!