Panasonic VT20 3D - SideBySide 3D doesn't work on VieraCast

This video shows how my brand new Panasonic VT20 3D TV doesn't work when the video source is internet. The problem affects to all Viera-cast content, so although the TV is sold as 3D, here you have an example with a video from YouTube (VieraCast). The source is clearly in side-by-side format, 16:9 (as this TV likes, since it is not able to re-scale videos... output format/resolution has to be exactly the input format)

As you can see, while playing this video, the source is side-by-side, but the 3D options available in the TV are: Automatic (it behaves like OFF), 2D -> 3D (simple 3D simulation... it still turns on 3D system: glasses, 3D effects, ...) and Original (again, behaves like OFF).

The 2D to 3D only generates 3D effect sending menus to foreground and image to background. Side-By-Side or Above-Below 3D options are not available in VieraCast mode, I understand that because of a bug in the firmware.