jcasgen-maven-plugin limitToProject property not working as expected

The following configuration does not produce any sources. Commenting out the limitToProject property solves the issue, and generates sources.

<plugin>
<!--generate types dynamically -->
<groupId>org.apache.uima</groupId>
<artifactId>jcasgen-maven-plugin</artifactId>
<version>2.6.0</version>
<configuration>
<limitToProject>true</limitToProject>
<typeSystemIncludes>
<include>src/main/resources/desc/type/*/.xml</include>
</typeSystemIncludes>
<typeSystemExcludes>
<exclude>src/main/resources/desc/type/*/_customized.xml</exclude>
</typeSystemExcludes>
</configuration>
<executions>
<execution>
<!--call it in the generate-source phase -->
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>

The relevant command line output before with limitToProject set to true:

[INFO] — jcasgen-maven-plugin:2.6.0:generate (default) @ suppint.nlp —
[INFO] JCasGen: Found descriptor '<path>\java\src\main\resources\desc\type\Relation.xml'
[INFO] JCasGen: Limiting generation to descriptors in '<path>\java'
[INFO] JCasGen: Output going to '<path>\java\target\generated-sources\jcasgen'
[INFO] JCasGen: Reading the XML TAE descriptor, and creating types, for xml input file '<path>\java\target\jcasgen\typesystem.xml'.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

The output without limitToProject:

[INFO] JCasGen: Found descriptor '<path>\java\src\main\resources\desc\type\Relation.xml'
[INFO] JCasGen: Output going to '<path>\java\target\generated-sources\jcasgen'
[INFO] JCasGen: Reading the XML TAE descriptor, and creating types, for xml input file '<path>\java\target\jcasgen\typesystem.xml'.
[INFO] JCasGen: Creating: <package>.types.Located'.
[INFO] JCasGen: Creating: '<package>.types.Located_Type'.
[INFO] JCasGen: Creating: '<package>.types.Relation'.
[INFO] JCasGen: Creating: '<package>.types.Relation_Type'.
[INFO] JCasGen: Creating: '<package>.types.Supplies'.
[INFO] JCasGen: Creating: '<package>.types.Supplies_Type'.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------