Why don't new entities load?

[Spazatron]

Say I have a game save in a map on my custom story, then I go into the Level Editor and add a new entity, for example a note. Why, when I reload that game save, does the entity not show? And I must restart the entire game from the start just for one entity to load? Is there something I'm doing wrong or is this just the way it goes?

[Daemian]

Because the gamesaves store the state of the map at that time, and all that new stuff you include later wasn't there when it saved.

[Mudbill]

... and so you must delete the <mapname>.map_cache file from your maps directory before loading it again.
I like to restart the game when adding entities, but it isn't necessary. Just do a normal reload.