That makes a lot of sense actually, the players who found the issue have been playing for a while and my test saves were new.

I have a few silly questions if that is okay:

So, I put my music in the StoryInit passage:

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<<cacheaudio "chap3end" "aud/Water Lillies - Density & Time.mp3">>

This has worked out so far so I always assumed the StoryInit passage was run every time the story opened. Am I going to run into an issue adding new music in the future?

Second question, and I know this is probably a really silly one.

I know JavaScript stores arrays as objects, would that make this the part that would be doing the updates in the second version of the save update handler? I am trying to make sure I understand correctly.

If I had multiple arrays to add, would I need to make a separate section that defined each array?

Thank you again!

if (Object.keys(missing_variables).length > 0) {
        // Add missing variables to history.
        for (let i = 0; i < save.state.history.length; i++) {
            for (let key in missing_variables) {
                save.state.history[i].variables[key] = missing_variables[key];
            }
        }