"USER ERROR: Scene instance is missing" when export with release in Godot_v4.3-stable_mono

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I had the same problem with you. I tried create this piece of code.
Replace all the default ResourceLoader.Load() with my version and the problem went away.

public static class Utils {

    public static Dictionary<string, PackedScene> CachedScenes = new();

    public static T CreateInstanceFromScene<T>(string path) where T : Node {
        if (CachedScenes.ContainsKey(path) == false) {
            CachedScenes[path] = ResourceLoader.Load<PackedScene>(path, null, ResourceLoader.CacheMode.IgnoreDeep);
        }
        return CachedScenes[path].Instantiate<T>();
    }
}
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