Why are low res artist images used in Discover page?

This issue certainly persists in the current release (1.3.223), and does seem to affect some images more than others. Any updates on this issue @support?

Here is an example Discover screenshot:

Notice in particular that the Charlie Haden/Jim Hall album cover shows extreme jpeg-like distortion. Here is the Album page, where the image is nearly the same size, but looks MUCH better:

Also, the Seattle Symphony image is extremely blurry. Compare here to the Artist page:

The London Symphony image on the Discover page looks rather normal by comparison. There is definitely a bit of peculiarity in the image rescaling here.