I am in make.powerapps.com.
Looking at a solution, showing all types of components.
I see everything.
Using the filter in the top right corner to show Other components only.
I now see web resources of type png, but web resources of type svg are not shown.
They should be, as they too are simply web resources.
Support issue ID: 119062722000962 (short video displaying the problem is in the issue)
Forum thread, strangely marked as "Solved": https://powerusers.microsoft.com/t5/General-Discussion/SVG-web-resources-not-displayed-when-showing-...