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QRCode transformer creat a one band raster with palette, You can use . RasterPaletteResolver. to convert it to RGB raster. so you can use RasterMosaicker.
Sounds like you may have palettes in your rasters. Try skipping the coercers/combiner and just use a RasterPaletteResolver, as I mentioned above.
I'm using RasterPaletteResolver on the grid but it seems to crash on a <Rejected> feature... Palette Keys -> Values : Band 3 : Palette 0 : 2195 -> AAA-1
Use the RasterPaletteResolver in FME
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