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Unintended behavior
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Description
Version used: 1.1.0-alpha02
Devices/Android versions reproduced on: any devices
Loading a png file generates a Bitmap with a colorless transparent background. (test.png)
Use heifwriter to save bitmap into a heif file. (0.heif)
As shown in attachment 1.jpg, all transprent areas have turned into black.
How to fix it. Thanks!!