Settings Notifications Icons Black Squares

Since the November update I've found my icons in Settings / Notifications 'Show notifications from these apps' are black squares.

I've tried deleting and rebuilding the icon and thumbnail caches, rebooted and still have the same.

Before the update they were fine and I've not noticed any other icons show the same.

Any way to clear or refresh these icons ?

Hmm. The first Macrium Icon now has an image in it, with a black background.
No idea how to get the other to display correctly.

I've uninstalled and reinstalled WinSCP and that hasn't helped.