Well, here's a bit more complicated situation of trigger_change level where you have 3 maps, map1, map2 and map3. You start the game in map1, and the level change works perfectly to map two. But when you cross the second level transition (in map2), nothing happens, no transition to map3. First i thought it was a mistake i've made but it isnt.

Ive made a fourth map... , map4, and started the game with the console to map2. The transition to map three worked! But finaly its the map4 transition that didnt work.

Thats how I noticed that it was always the second transition which was corrupted. Maybe I missed something?????