'C++ Unordered map initializer map not initializing properly

I'm relatively new to hash maps. I have the following code in my program:

    std::unordered_map<int, int> XY ({
        {0, 0}, {0, 3}, {0, 6},
        {3, 0}, {3, 3}, {3, 6},
        {6, 0}, {6, 3}, {6, 6}
    });

For some reason, the map only contains the first three pairs ({0, 0}, {0, 3}, and {0, 6}). Even when I cout the bucket count, it outputs 11. Yet, there's still only three in my map. How do I fix this? It seems unreasonable to do a bunch of .insert()'s.

c++hashmap


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