Blender 2.80 Alpha 2
date: 2018-11-14 22:51
Maybe a bug maybe not but when I am creating a new file the workspaces tabs disappear and I can add them to show only by Loading factory settings.
File -> New -> General - All work space tabs disappear except "General" and "+"
File -> Load Factory Settings - All tabs shows up again, but will be removed when clicking new file again.
Attaching a short video.