Create marker cluster with multiple layer-group

[CharlotteAndre]

Hi, I'm using marker-cluster with layer-group where each layer represents a depth in a same point in the sea. My code a for now constructed like that

<l-control-layers :collapsed="true"></l-control-layers>
      <l-layer-group  layerType="overlay" v-for="code in depth_codes" :key="code.depth"
                      :name="code.depth"  :visible="code.visible" >
        <v-marker-cluster :options="clusterOptions">
          <div v-for="(circle,index) in circles.filter(({depth}) => depth === code.depth)" v-bind:key="index">
          <l-circle-marker v-for="(point,index_point) in circle.coordinate"
                           v-bind:key="index_point"
                           :lat-lng="point.center"
                           :radius="point.radius"
                           :color="circle.color">
            <l-tooltip>{{ point.text}}{{ point.radius }}</l-tooltip>
          </l-circle-marker>
          </div>
        </v-marker-cluster>
      </l-layer-group>

My problem is the following, my marker cluster only appear of point are in the same layer-group.... But i really would like for them to include all points for close location even if they are in different layer... So I already tried to move the <v-marker-cluster> outside of my l-layer-group div but nothing seems to appear... Any idea on how to do it ?

Version :
leaflet : 1.7.1
vue2-leaflet : 2.7.1
vue2-leaflet-markercluster : 3.1.0
vue : 2.6.11