You can duplicate the current workspace through multiple means, such as this answer (File -> Duplicate workspace). Then you can work on some other set of files there.
Then, if you close/reopen with proper settings, you get both workspaces back. However, if you accidentally open something else first, e.g. some app runs it as EDITOR, the workspaces are not reopened and only the non-duplicated one stays on the recent workspace list.
Is there any way to recover the duplicated workspace after such incident? If so, how?