[vertex-four]

Go to [0], install, configure to either "all windows" or "all windows in current workspace", and alt+tab probably works like you want again. It's not terribly difficult.

[0] https://extensions.gnome.org/extension/15/alternatetab/

[rglullis]

Or, you know... just keep using an old, stable, dependable version. But you can't do that with GNOME since they are such rabid fans of the CADT model.