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Bug
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Resolution: Fixed
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P2: Important
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6.5.7, 6.8.0
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68d001150 (dev), 1e605b6e0 (6.10), d3c5bfbf6 (tqtc/lts-6.8), 0899651c8 (dev), d2c8fcb75 (6.10), 2b4959e69 (tqtc/lts-6.5)
QPainter paints transparent pixels white on macOS with composition mode CompositionMode_Source and image format QImage::Format_RGBX64 (as shown in macos.png). On Windows the pixels are painted black (windows.png).
The attached example can be used to reproduce the issue.