No icon shown for custom capabilities

I have a couple of custom capabilities for my device, but even if the icon is included and validation against publish reports OK, I always get a spinner instead of the icon when looking at the sensor values for the device in the Homey App.

There’s an issue with SVG-icons, Athom is looking into it:

I see, thanks!

@Will_o_Wisp @bvdbos
For your Info, this issue should be fixed!