copy task does not respect failonerror=false

When defining a copy task, the antrun plugin propagates it's failure although "failonerror" is set to true: the maven build stops.

In my case I try to copy a file which does not exist in some maven build situations. The build should not fail but try to copy a different file instead. With antrun 1.2 it still works (the build continues with the next copy task), but with the current version the build fails.

<configuration>
<tasks>
<Unable to render embedded object: File (-- in single project builds, the file to be copied has a different name - reactor build with antrun 1.3 fails here, though failonerror is false) not found. -->
<copy file="$

/model.xml" overwrite="true" verbose="true" failonerror="false" />
<!-- in rector builds, the name of the file contains the correct maven type (xmi) and the version number -->
<copy file="$

/model.xml" overwrite="true" verbose="true" failonerror="false" />
</tasks>
</configuration>