I have run into same issue. The curtains that are on the rods, the bare rods, and the pull shades don't fit in a 16 px cell.
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Yes, using png tilesheet. Here is a screenshot. You can see curtains at the top fitting in the grid nicely, but not the ones with rods. https://imgur.com/a/lUtPrYV I also found this morning that a (single)bed I used from the one of the other tilesheets has a sliver of the next bed to the right of it on the sheet.