So. I did some national spirits but in the focus tree they don't work.

For Example:

The Idea is called : United Forever

Then i write in the Focus: add_ideas = united_forever

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Mostly this works but sometimes it doesn't work.

I looked in the code (common/ideas/file)

And then I saw that the Idea had an ID like: ADjdwX

although everything was fine.

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Does someone know what the problem could be?

You possibly have something else called "United Forever" somewhere else?

When the exporter sees an ID has been used before somewhere (as a focus, event, idea, etc.) it will generate a random ID, to ensure there are no conflicts in the game.

If you give your ideas list a unique prefix, it should prevent this issue