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I am using the Google Maps Android API Utility Library to enable clustering in my app. When five or more markers are co-located a cluster is created:

Four or fewer similarly co-located markers won't create a cluster:

Is this by design or am I doing something wrong, because my maps have 2, 3 or 4 markers that clearly overlap, but won't form a cluster?

The code to demonstrate the problem:

Map layout:

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:map="http://schemas.android.com/apk/res-auto"
      android:id="@+id/map"
      android:layout_width="match_parent" …