using UnityEngine;

public class ZoomInOnDoubleClick:MonoBehaviour
{
    private OnlineMapsControlBase3D control;

    private void Start()
    {
        control = OnlineMapsControlBase3D.instance;

        // Disable zoomInOnDoubleClick
        control.zoomInOnDoubleClick = false;

        // Subscribe to double click event
        control.OnMapDoubleClick += OnMapDoubleClick;
    }

    private void OnMapDoubleClick()
    {
        // Get input position
        Vector2 screenPosition = control.GetInputPosition();

        // Get 2D marker
        OnlineMapsMarker marker2d = OnlineMaps.instance.GetMarkerFromScreen(screenPosition);

        if (marker2d != null) return;

        // Get billboard and 3D marker
        // I know that this is not logical, but it works.
        OnlineMapsMarkerInstanceBase marker = control.GetBillboardMarkerFromScreen(screenPosition);

        // If marker == null then zoom in.
        if (marker == null) control.ZoomOnPoint(1, screenPosition);
    }
}

Both. We just missed it.
I think we rework this behavior.
Thank you pointed out to us on this issue.

I found that map will zoom in one level when tap the marker (billboard or 3d) if the zoom in on double click is checked.
Is it a feature or a bug?

Thank you for your time.