Export of Retina hijacks Id

Dear xara...

I have a shape and I choose to Export as JPEG.
I call it NiceImage and alsp pick Retina: I get NiceImage.jpg andNiceImage@2x.jpg.
You also add an Id of NiceImage@2x.

If I add my later Id, it never gets output, only id='NiceImage:642x'.

What is it for?
It only appears if Retina is picked.
It does not tie up to anything else.
We now have a Name, an Image Filename, the entry in the Page & Layer gallery, the Bitmap gallery with file extension and what I exported it as.
If I were to use Live copy this Name is duplicated; as an Id in HTML, it is therefore worthless.

Acorn