I've already twittered this at Discord, but I though I'd mention it here as well to get potentially more visibility:
On the new Edge Insider Builds (I am using the Dev-Channel) all Server-Icons and PFPs are Square with no rounding whatsoever. this also means, that the Ping-Indicator and the Online-Status symbols are also above the Icon/PFP.
This issue also exists on the EdgeHTML Builds but not on the latest Stable of Chrome (76). It also doesn't seem to be a UA issue either, as it keeps persisting, even with a Firefox 46 and a Chrome 78 UA.
Here's an image of what it looks like:
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