I'd think this is pretty low priority and also i didn't render to check if the low res is only editor-wise or if it appears in the exported spritesheet.

You can probably reproduce it following this video I recorded: https://streamable.com/t81ym

Please excuse the offset mouse, the capturing software isn't that good with 4k resolution.

Oh interesting, I think the problem is probably with the texture filtering getting disabled on the duplicated emitter (this can be enabled/disabled in the texture section), but I'll look into it :)

Oh you're right! The duplicated one didn't duplicate the Filtered checkbox option.