Alt + Tab function is broken in 20H2 build while using MS Edge only

Yes, me too facing this issue since the feature is implemented in release preview builds. They mentioned in first few builds that they fixed some issue related to Alt+tab experience, but didn't mentioned what exactly was fixed. I always checked the release notes of every build to see that whether this is fixed or not but the issue is still same.

When doing Alt+tab to quickly switch windows, after few attempts it starts switching between 3 windows rather than 2. Although switching windows quickly is a rare thing, but it's important in few use cases like when you are comparing something like images, text etc on 2 windows. In this case you just want to quickly switch windows to know exact & fine differences.

This quick switching functionality of Alt+tab works perfectly fine when feature that includes Edge tabs in Alt+tab is turned off from Windows Multi-tasking settings. Also, this issue is I think of OS level rather than just the browser issue. So, it might be fixed in a future build of Windows 10 but don't know when it's going to be fixed. The more important question is how a feature is completely rolled out without fixing all related issues and many are still facing this issue that is impacting their productivity.