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If you want a tiny fraction of offset, use float.epsilon. 0.01 will actually be noticeable. It's about 1/6th of a texture pixel.

Okay, so after a lot of debugging, I finally got it working. I took some inspiration from how the observer block works and manually called World#notifyNeighborsOfStateChange, on all adjacent blocks, after setting the powered or unpowered block states of the Gazing Glass. It now works just fine I was under the impression that such block updates occurred automatically when you set a block state, but apparently not. Is there a better way to do this, or is that the correct way?