To add some more examples, I tested a flatter slope, which exposes the problem a bit more I think.
Here the tiles are at “half height”, i.e. 32x16 pixels, and they match up perfectly pixelwise, but not physics wise. I see two problems. 1, one tile is “thinner” than the other. 2. at the top right corners of the tiles, the slope of the physics becomes flat, making it an uneven surface within the tile.
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