Cluster pop animation keeps popping when I zoom or move

Hi,

I am using the cluster manager in order to display my markers on my map. I wanted to add the pop animation on the appearance of my marker. However every time that I try to move or to zoom on the map, my markers keep re-appearing.
At the beginning, I was just using custom icons on my markers and they kept blinking every time I zoomed or moved on the map. In order to simplify the demonstration, I am just using the pop animation on the appearAnimation of the marker.

First I thought it might been due to the clearItems then to the cluster again so I tried to optimize the renderer a little bit:
``` swift
func updateCluster(clusterManager: GMUClusterManager, markerItems: [MarkerItem]) {
var markersToAdd: [POIItem] = []
var markersToDelete: [POIItem] = []
for markerItem in markerItems {
if mapDisplayedItems.contains(where: { $0.id == markerItem.id }) == false {
let position = CLLocationCoordinate2D(latitude: markerItem.lat, longitude: markerItem.lng)
let mapItem = POIItem(position: position, id: markerItem.id, picture: nil, markerItem: markerItem)
markersToAdd = markersToAdd + [mapItem]
} else if let mapDisplayedItem = mapDisplayedItems.first(where: { $0.id == markerItem.id }), mapDisplayedItem.position.latitude == markerItem.lat && mapDisplayedItem.position.longitude == markerItem.lng {
mapDisplayedItem.position = CLLocationCoordinate2D(latitude: markerItem.lat, longitude: markerItem.lng)
}
}
for mapDisplayedItem in mapDisplayedItems {
if markerItems.contains(where: { $0.id == mapDisplayedItem.id }) == false {
markersToDelete = markersToDelete + [mapDisplayedItem]
}
}
for markerToDelete in markersToDelete {
mapDisplayedItems = mapDisplayedItems.filter({ $0.id != markerToDelete.id })
clusterManager.remove(markerToDelete)
}
mapDisplayedItems = mapDisplayedItems + markersToAdd
for markerToAdd in markersToAdd {
clusterManager.add(markerToAdd)
}
if !markersToAdd.isEmpty || !markersToDelete.isEmpty {
clusterManager.cluster()
}
}
```
Then in my renderer method, I tried to optimize it too:
``` swift
func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
guard let myItem = marker.userData as? POIItem, var markerItem = myItem.markerItem, !markerItem.hasBeenRendered else {
return
}
marker.appearAnimation = .pop
markerItem.hasBeenRendered = true
}
```
#### Environment details
iOS: 15.4
GoogleMaps: 7.0.0
GooglePlaces: 7.0.0
GoogleUtilities 7.7.0
Google-Maps-iOS-Utils: 4.1.0

Thank you for your help!