custom pin image not showing in iOS < 13.0, It showing red default pin image.

[pawanline]

Description
I am using clustering on Apple MKMapView but custom image pin not working on iPhone 8 (11.1) and same is working on iPhone 8 (13.2.2)
Screenshots

Smartphone

• Device: iPhone 8
• OS: 13.2.2 and 11.1
• Version: [e.g. 22]

Checklist

• [y] I updated Cluster to the latest version.
• [y] I read the Contribution Guidelines.
• [y ] I read the documentation.
• y] I searched for existing GitHub issues.

[pawanline]

Please look into this asap.