mapedit has not been taken much into account, and can crash; especially with mods.

[Lemonymous]

The console command mapedit will bring up a map editor. Maps in the map editor can be tested, which launches a non-standard mission with a pretty bare-bones mission object. This mission object is the same for every mission in the map editor.

If we can find this mission object, and can detect when this mission starts and ends, we could try to make it operate more similar to a standard mission. Or alternatively, maybe make it operate more similar to Test Mech Scenario, since both of these missions share the trait of not have a save game to refer to.

I have spoken briefly with narD, who has made several videos showcasing neat interactions in "narD's Lab" using mapedit. They could confirm that the map editor is not stable when using it with mods.

[Lemonymous]

Update:
The mission object used in mapedit is in fact the same one used in Test Mech Scenario: _G["Mission_Test"]