The buildinfohelper function scan_image_artifacts() does not consider IMAGE_EXTENSION when it populates the image_file_extensions_unique set. In case a BSP inherits from x86 it gets IMAGE_FSTYPES += "live" from x86-base.inc. The "live" image then gets mapped to "hddimg iso" in image_types.bbclass so hddimg and iso are generated in the deploy dir. In the mentioned Toaster function/class Toaster still tries to find an image file with .live suffix which is not available obviously so in turn it does not even display the build artifacts after build completion. A workaround would be to simply add "hddimg iso" in the IMAGE_FSTYPES for this particular BSP but that would be a "workaround".
This will be fixed as part of the 10283 transition.
Bulk move from 4.99 or 0.00 to 5.99