Whoops! Sorry, my fault. But yes, a block entity (tile entity in 1.16-) *is* needed for storing data (i.e. furnace). But I think what OP is doing is making an item combiner, which doesn't need one

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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.

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