I have ti working with tiff files and a line art channel. It can read the file and display the RGB portion of the image=, with no color change where the alpha channel has information, even when it’s solid black.
If all I wanted was to remove the line art channel, Photoshop Droplets could do that. What I want is to display multiple images in the app without the lineart channel. Since I have thousands of PSDs with lineart channels, I don’t want to have to make duplicate files without the lineart/alpha channel.
I don’t really see much of a choice here, short of writing your own rasterizer for the PSD format or shelling out to something like ImageMagick. I doubt Xojo would make any corrections as they’re just relying on what the OS gives them and it’s an unsupported format. Maybe you could report it to Apple and it would be fixed at the OS level, but I wouldn’t wait for that to happen.
You can always open an issue with Xojo and see what they say. Maybe there is something they can and are willing to do here.
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There is also a Python-Library, that may help here.