Copy operation misses some child nodes

  
microKernel.commit("/", "+\"y\":{}+\"x\":{}", null, null);
microKernel.commit("/", "+\"x/miss-me\":{} *\"x\":\"y/copy-of-x\"", null, null);

{
    ":childNodeCount": 2,
    "y": {
        ":childNodeCount": 1,
        "copy-of-x": {
            ":childNodeCount": 0
        }
    },
    "x": {
        ":childNodeCount": 1,
        "miss-me": {
            ":childNodeCount": 0
        }
    }
}

{
    ":childNodeCount": 2,
    "y": {
        ":childNodeCount": 1,
        "copy-of-x": {
            ":childNodeCount": 1,
            "miss-me": {
                ":childNodeCount": 0
            }
        }
    },
    "x": {
        ":childNodeCount": 1,
        "miss-me": {
            ":childNodeCount": 0
        }
    }
}