In relation to MC-19201, marked as invalid because of sugestion.

Sometimes, when exploring regions, your minecraft get very laggy, but chunks are generated as you walk forward, but at somes moment you need to stop walking because there are chunks not already loaded, at those moment, we want to restart Minecraft, pressing escape, waiting for the saving message in the lower left corner and then click on the "Save and quit to title" to the main menu, wait and quit or reload the world, we have high chance to have a rollback because it's not actually saved !!!

As I've seen, there is no more saving message in the lower left corner and dev console messages says "Saving chunks for level 'New World'/Overworld" and not "Saved chunks for level 'New World'/Overworld"

So now it's not a suggestion to add save-all command to be disable on lan world, but a bug report for the world and player not saving since world generation seem to continue (so the server seems to not have crashed)...

How can we be sure that the server has completely saved world and player informations if we don't have any saving message in the pause menu, the world and player is not actualy saved ?

How can we be sure that the server has completely saved world and player informations if when we are at the main menu, the world and player is not actualy saved ?

Two of the solution I can propose :
1) To not return to the main menu until the world is not completely succesfully saved with a screen similar to the loading screen. Or to change from "Save and quit to title" to "Quit to title" if clicking that button don't save the world and we must wait for the world to be saved.
2) To have access to the save-all command, so we can be sure by chat message that the server has done the save work it don't do if we simply return to menu in that condition. or possibility to handle it with a button in the pause menu.