SDK: Export filter renditions ignore filteredSettings when using "export with previous"

Dear,
I am really confused about this. I have made an export filter that modifies the size settings in the export dialog, waits the rendering and then makes some stuff. It works ok when I click on the photo and then use "Export..." button. The problem happens when I use "Export with previous", in that case it seems to not use the filterSettings function.

This is a dummy code, it just modifies the rendering size and then do nothing. If I export with the "Export..." button, the export dialog appears and the photo is rendered to fit 100x100 pixels as stated in filterSettings. If after that I use "Export with previous" button, the dialog does not appear (this is ok), but the rendering is made without overriding the user settings for the image size; it works as if filterSettings function were empty.

postProcessRenderedPhotos= function ( functionContext, filterContext )	
    local properties=filterContext.propertyTable

    local renditionOptions = {
        plugin = _PLUGIN,
        renditionsToSatisfy = filterContext.renditionsToSatisfy, 
        filterSettings = function( renditionToSatisfy, exportSettings )
            exportSettings.LR_size_maxWidth = 100
            exportSettings.LR_size_maxHeight = 100
            exportSettings.LR_size_doConstrain = true
            exportSettings.LR_size_resizeType = "wh"
        end,
    }

    for sourceRendition, renditionToSatisfy in filterContext:renditions( renditionOptions ) do
    local success, _ = sourceRendition:waitForRender()
        if success then
            renditionToSatisfy:renditionIsDone( true)
        else
            renditionToSatisfy:renditionIsDone( false, "Failed to render photo in upstream task" )
        end
    end
end

This code is an oversimplification of mine. In case setting the filter to not show the image size properties section in the export dialog solves the problem, I will not be able to do that in my scrip, I do need the user set the image size (and then make some calculus and override)