I've found two more bugs in the meantime. First, the Editor doesn't regonize or create new triggers with the "Cap=Win/Des=Lose" action (used in Nod missions 3 and 12). Secondly, the "Built It" trigger condition is incorrectly spelt as "Build It", leading to trigger failure.

It may be also useful to limit trigger names to four characters, as triggers with longer names are ignored by the game.