Export panel transparency is black

Hi,

when I use the export panel and save transparency from psd to tiff it looks black on the thumbnail.  This is OK as it is only the thumbnail.

But when I export the same psd with transparency to jpeg, the background of the jpeg is also black.  In the past with image processor, it was standard white.

Now it comes.  When I first convert to tiff with transparency and then convert those tiffs to jpeg.  The transparency is converted to white.

Very illogic and I guess a bug.  I found one other post on this, but no answer from Adobe.  Also weird there is no report on this.