Shape drawable in layer-list rendered incorrectly for APIs below 23

First of all, I'd like to thank @pskink for helping me to analyse the problem :)

The xml in the question worked for API level 23+, because

it is possible to set width and height right within the "item" tag

like @android developer states in this SO post

It did not work for lower versions, because there one needs to set width and height attributes for a ShapeDrawable using the size tag.

I suppose Android needs the size to figure out how to scale the drawable (-> aspect ratio!) while taking into account the insets (top, left, right, bottom).

And as is sometimes the case with malformed (for a specific API level) xml, Android failed silently and simply did not draw the shape.

So the solution is:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:width="80px" android:height="80px"        android:top="0px" android:left="0px"         android:right="0px" android:bottom="0px">        <shape android:shape="rectangle">            <solid android:color="@color/deep_orange"/>        </shape>    </item>    <item android:width="60px" android:height="60px"        android:top="10px" android:left="10px"         android:right="10px" android:bottom="10px">        <shape android:shape="oval">            <solid android:color="@color/light_yellow"/>            <size android:height="60px" android:width="60px"/>        </shape>    </item></layer-list>