v8.0.15
I accidentally opened Perspective up in Edge instead of Chrome but I noticed that Icons don’t appear to be working in Edge. Comparison below Edge vs Chrome.
These are the properties set for the button:
When using an Icon either in a button, or just an icon on the page. I have found that they dont seem to render on Microsoft Edge.
When the icons are in a button, it also changes the button to render the default background, even when there is a style class applied that makes it transparent.
View on edge
View on Chrome:
Is this Chromium Edge or “old” Edge?
It’s not-the-new-logo Edge, if that helps… not this one 
(I launched on another machine so don’t have the old one installed)
I found that as well with transparency, old Edge didn’t like it at all. Those chevron buttons had a transparent colour set to their background and they went black
Mine is in "old edge", which unfortunately is a requirement from my customer at this time.
However I did try it on Chromium Edge and the issue dissapears
This is not an official statement from IA, but I can’t say that getting things to work on “Edge Legacy” will be a great idea, given that support is being dropped in less than six months:
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Sounds like I good reason for me to push for them to switch to new edge!