It seems we're having the disappearing tabs issue again with Edge Canary Version 108.0.1438.0 (Official build) canary (64-bit). If the browser is minimized for a while, when it is maximized all the open tabs are black or invisible). To see them again, click the + to open a new tab.
This happened a while back and appears to have come back in this lastest version.
Just updated to Version 108.0.1444.0 (Official build) canary (64-bit). I'll update this post if the issue is resolved. It really is more a nuisance than anything else.
I updated/upgraded to Windows 11. The latest version of Canary - Version 108.0.1449.0 (Official build) canary (64-bit) appears stable. But now the issue is in Edge Dev - Version 108.0.1438.1 (Official build) dev (64-bit).
Update: After being minimized for a period of time, the tabs all go dark on the latest version.