If the nodes passed as input are the leaf nodes, then what do the parent nodes/root node contain? How does the traversal given a query occur?

When I'm using VectorStoreIndex(nodes, embed_model=embed_model, storage_context=storage_context, show_progress=True) and the TextNodes have metadata associated with them, what gets embedded, just the text or text and metadata? I have some nodes where the text is below the maximum token input count but I'm getting an error stating that it exceeds the maximum count

I think the issue is more that when using PGVectorStore I cannot directly get the nodes so I'm using vec_store.query(VectorStoreQuery(similarity_top_k=100_000_000)).nodes to fetch all nodes. However these nodes returned have no embeddings despite the DB showing the embeddings in the corresponding column