saving a property of a nt:unstruc​tured type changes the type of that property

I upgraded my project from hippo-ecm-package-war version 2.16.02 to 2.16.05. It seems that now the way the console handles the types of jcr nodes has changed. A property that was defined as sv:type="Boolean" is changed after saving to sv:type="String". This is really unexpected and leads to errors like "java.lang.UnsupportedOperationException: The type class java.lang.Boolean with value type '1' is not supported." in my application.

So, in version 2.16.05 in the xml-export before changing has:

<sv:property sv:name="active" sv:type="Boolean">
<sv:value>false</sv:value>
</sv:property>

After changing, the exported xml has:

<sv:property sv:name="active" sv:type="String">
<sv:value>true</sv:value>
</sv:property>

The type has changed! This did not happen in 2.16.02 and seems a bug to me.