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It is probably not satisfying, but the actual answer is: You can't create a layer group in indexed mode because this has not been implemented in GIMP.
In computing, indexed color is a technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers. It is a form of vector quantization compression. When an image is encoded in this way, color information is not directly carried by the image pixel data, ...
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