I have been struggling with this whole night. All I want to do is multiply two rasters together. I know I can do that with RasterSource, but I need better performance. When I create a layer (webgl) for each individual source, extracting the data works fine: [“band”, 1], … [“band”, 4], where the first 3 bands are the same (storing byte), and the fourth is the opacity. But if I have 2 or more sources, I can’t extract the data from more than one source (which, funnily enough, is always the the last one in the array).