Is it gif? I recently noticed that gif transparency acts very weird on the different versions of Graal. If it's not animated, it's best to use PNG.
If it is animated... well good luck. The only help I can offer is what Stefan told me: "Try to turn off gif optimization, there is problem because of black or redraw. Most of the time it's not saving a lot of file size"
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Xor fixed it and updated it cosmetically