Panel: icons gone after update to 3.4


After updating from 3.3.5 to 3.4, the icons in my panel are gone:

instead of:

I can’t get them back. Any ideas?

There has been a change in 3.4, you would have to adapt your blueprint.

New image: icon and image: false options for items in pages or files sections.

So, image: false has to be changed to image: icon. While image: false mean no image, no icon.