There is a new merge on the Wayland GitLab repo. This new merge (of an old pull request) adds xdg-session-management protocol to Wayland. This is a big development and certainly a feature Linux users will enjoy.

As per the brief message in merge request:

For a variety of cases it's desirable to have a method for negotiating the restoration of previously-used states for a client's windows. This helps for e.g., a compositor/client crashing (definitely not due to bugs) or a backgrounded client deciding to temporarily destroy its surfaces in order to conserve resources.

This protocol adds a method for managing such negotiation and is loosely based on the Enlightenment "session recovery" protocol which has been implemented and functional for roughly two years.

In simpler words, session recovery is finally coming to Wayland.