(Apologies for the extra post, but I couldn't post links otherwise.)

Here's a link to Microsoft's explaining the "new" channels (https://docs.microsoft.com/en-us/deployedge/microsoft-edge-channels) and their blog post announcing the new channel "branding" (https://blogs.windows.com/windows-insider/2020/06/15/introducing-windows-insider...).

And here's the download page for all Edges (https://www.microsoftedgeinsider.com/en-us/download).

Yes, there's yet a third bookmark set, I believe.  The path for Edge Beta is

~/Library/Application Support/Microsoft Edge Beta 

.  That would put their favorites for the Default profile in

~/Library/Application Support/Microsoft Edge Beta/Default/Bookmarks 

. I believe I read something about the Native Messaging hosts, and so that on Edge Beta is in

~/Library/Application Support/Microsoft Edge Beta/NativeMessagingHosts 

.

Hello, Evan.

The current versions of our apps support Edge, which is currently at version 87, and Edge Dev, which is currently at version 89.  As Microsoft did it, these two have independent bookmark sets, meaning that (without using any of our apps), if you add or delete a bookmark in  Edge, then launch  Edge Dev, the change does not appear in  Edge Dev.

I want to be very clear on what you mean, and also I am a little lazy.  Please tell me where and how you got Edge Beta.  Include a hyperlink if applicable.  Do you have all three Edges installed, and do they indeed have independent bookmarks sets?