Scripting SaveForWeb via JS

Hi folks,

I´m trying to use Adobes JS API to export an open document in different versions / settings

via SaveForWeb in PS 2014 (2014.2.2 20141204.r.310) :

- one "progressive"

- one "optimized"

- one without any of these two

A short snippet (for exporting "optimized" version) for ExtendScript Toolkit CC:

var exportOptionsSaveForWeb = new ExportOptionsSaveForWeb();

exportOptionsSaveForWeb.format = SaveDocumentType.JPEG;

exportOptionsSaveForWeb.includeProfile = false;

exportOptionsSaveForWeb.interlaced = false;

exportOptionsSaveForWeb.optimized = true;

exportOptionsSaveForWeb.quality = 60;

var target = new File('~/Desktop/EXPORT_TEST/jpg_optimized.jpg');

var doc = app.activeDocument;

doc.exportDocument(target, ExportType.SAVEFORWEB, exportOptionsSaveForWeb);

No matter what combination of "interlaced" and "optimized" params I use, the result is always a progressive/interlaced JPEG.

Even if I use the code produced by ScriptListener (which I really wouldn´t prefer)

after exporting the desired file manually: the result is always an interlaced JPEG!

I really go nuts on this one.

Any ideas, or maybe a known bug?!

Thanks in advance!