Marker disappears from parent layer after setting marker new coordinates

[rsnow67]

• [+] I'm reporting a bug, not asking for help
• [+] I'm sure this is a Leaflet.MarkerCluster code issue, not an issue with my own code nor with the framework I'm using (Cordova, Ionic, Angular, React…)
• [+] I've searched through the issues to make sure it's not yet reported

---

How to reproduce

• Leaflet version I'm using: 1.9.4
• Leaflet.MarkerCluster version I'm using: 1.5.3
• Browser (with version) I'm using: Chrome 113.0.5672.126
• OS/Platform (with version) I'm using: macOS Ventura 13.4

Steps:

1. Initialize map
2. Сreate new markerClusterGroup
3. Add markerClusterGroup to map by addTo()
4. Create new marker
5. Add this marker to markerClusterGroup by addLayer()
6. Try to get marker by getLayer() from markerClusterGroup – you'll get it
7. Remove markerClusterGroup from map by removeLayer()
8. Set marker new coordinates by setLatLng()
9. Try to get marker by getLayer() from markerClusterGroup – you'll get null
10. Re-add markerClusterGroup to map
11. Try to get marker by getLayer() from markerClusterGroup – you'll get it
    (all code below)

What behaviour I'm expecting and which behaviour I'm seeing

I expect that after setting marker new coordinates I can get marker by getLayer() method before I re-add parent layer to map, but I get null.

Minimal example reproducing the issue

• [+] this example is as simple as possible
• [+] this example does not rely on any third party code

https://plnkr.co/edit/UUuWoMVgk85eyHQk