Packaging problem with "list of map to include"

Hi there,

For my current game on UE4.25 I’ve got the full game and the demo.
Both are using a different “List of map to include in packaged build” and default map.
I switch the DefaultGame.ini and DefaultEngine.ini depending of which version I want to pack.
And “Cook everything” is not checked.

But when I pack the demo, it has the size of the full game despite having only having 1/10 of all levels.

What can I do to solve this?
Thanks for your help!