Have fielded multiple reports of a single sprite being garbled. The glitches only occur when "Texture compression: Low quality" is enabled in Factorio graphics settings. High quality compression or zero compression do not produce the artifacts. The entity uses a non-animated base sprite and an animated working visualisation in additive render mode, I'm assuming it's the working visualisation that's garbled because the garbling changes per frame. There is nothing different as far as I know about the method used to produce these sprites, I used exactly the same methods on at least 10 other entities which all work well in low quality compression mode, although none of them are this size (320x384 per frame). The resulting sprite sheet is therefore large (3200x2304), 60 frames in 32-bit colour, although a fair amount of the sheet is transparent space which is trimmed away by Factorio -
If anyone has any insight, please let me know.