Why do the children of MarkerClusterNode depend on the zoom level in the onClusterTap?

[Long9725]

Parent cluster node with two cluster child	Child cluster nodes

Expect the length of children of parent is always 2, but it depended on the zoom level. When zoom level is 11, the length is 1. But zoom level is 16 (before the cluster disintegrates), the length is 2 and it's same the real length. Why do the children depend on the zoom level?

# parent log when zoom level is 11

[MarkerClusterNode] 
current node runtimeType: MarkerClusterNode, 
zoom: 11, 
children: [Instance of 'MarkerClusterNode'], 
markers: [Instance of 'MarkerNode', Instance of 'MarkerNode', Instance of 'MarkerNode', Instance of 'MarkerNode']

# parent log when zoom level is 16

[MarkerClusterNode] 
current node runtimeType: MarkerClusterNode, 
zoom: 16, 
children: [Instance of 'MarkerClusterNode', Instance of 'MarkerClusterNode'], 
markers: [Instance of 'MarkerNode', Instance of 'MarkerNode', Instance of 'MarkerNode', Instance of 'MarkerNode']

MarkerClusterLayerOptions(
  onClusterTap: (markerClusterNode) {
    log("current node runtimeType: ${markerClusterNode.runtimeType},\nzoom: ${markerClusterNode.zoom},\nchildren: ${markerClusterNode.children},\nmarkers: ${markerClusterNode.markers}",
        name: "MarkerClusterNode");
  },
)

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