spec txt and id set without localization files shows the id in the panel

I'm using the latest version available in maven central: 4.3.2

In our install.xml we have this:
<res id="userInputSpec.xml" src="panel-configuration.xml" />

this panel-configuration.xml contains as example this:
<panel order="1" id="clustering.panel">
<field type="text" variable="JBOSS_PARTITION_NAME">
<spec txt="Partition name :" size="20" set="foo" id="jbosspartition"/>
</field>
...

If we now run the installer we see a stacktrace about the localization file that could not be loaded and the panel itself shows "jbosspartition" as label instead of "Partition name :"

As a temporary fix we removed all our id attributes. But the documentation states that when no localisation file is found he should fall back to the txt