This is a holdover from VBA, but MOSAIC on OBJs is implemented wrong.
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Here's an example: I booted up my actual copy of Aria of Sorrow to compare with VBA-M's output:
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This is wrong. The mosaic tiles are supposed to be aligned with the background.
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I found similar examples in other games (e.g. Metroid Fusion), but this is the most visibly wrong that I found.