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SpatialAnchor and WorldAnchor save in the same store?

I read somewhere that these two are synonymous of one another, so I assumed they would save to the same store.
I have a UWP saving a SpatialAnchor to the store and I'm trying to load it in a 3D one. But nothing loads.

Below the code to load the WorldAnchor:

void Start()
void AnchorStoreReady(WorldAnchorStore store)
    anchorStore = store;
    string[] ListaAncoras = anchorStore.GetAllIds();
    txtRef = AncoraText.GetComponent<TextMesh>();
    txtRef.text = Convert.ToString(anchorStore.anchorCount);
    foreach ( string x in ListaAncoras)
        txtRef.text += x + " - ";

This returns 0 on the count and no IDs. And I am sure I am saving the SpatialAnchor well, as I can load it again on my UWP app.

Any clue?
Basically what I need is to transfer a coordinate system of a frameofreference from the UWP to the 3D. Hence why created a SpatialAnchor from the frame of reference coordinate system and persisted it to the store.

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