Create an ImageMosaic layer from a multichannel image.
Setup an SLD with an RGB ChannelSelection, as an instance R=5,G=2,B=3
LayerPreview properly re-order the channels as specified in the style.
StyleEditor - LayerPreview on that layer results into ignoring the specified order, returning the 1st,2nd,3rd channels instead
The issue only occurs with layer served by coverageFormats supporting the optimized Bands selection.