I notice that in the NSBTX Editor, exporting an image you're working with won't maintain the BTX's palette as-is. It just exports a regular non-indexed PNG. It ought to output an indexed image based on the selected palette. Without doing this, re-importing an image you just exported will get the image data out of sync with other palettes in the BTX.
I notice that in the NSBTX Editor, exporting an image you're working with won't maintain the BTX's palette as-is. It just exports a regular non-indexed PNG. It ought to output an indexed image based on the selected palette. Without doing this, re-importing an image you just exported will get the image data out of sync with other palettes in the BTX.