DirSet toString returns files

[twoseascharlie]

Describe the bug
Using anything that would cause a DirSet toString returns files instead of directories.

Steps To Reproduce
Example build.xml:

<?xml version="1.0"  encoding="UTF-8" ?>

<project name="tmp.testing" basedir="." default="tmp.test.dirs">
    <property environment="env" />
    <property name="source.root" value="${phing.dir}" />
    <echo msg="source.root: ${source.root}" />

    <target name="tmp.test.dirs">
        <dirset id="dist.contents" dir="${source.root}" includes="src/**">
        </dirset>
        
        <property name="prop.dist.contents" refid="dist.contents"/>
        <echo msg="prop.dist.contents: ${prop.dist.contents}" />
    </target>

    <target name="tmp.test.files">
        <fileset id="dist.contents" dir="${source.root}" includes="src/**">
        </fileset>
        
        <property name="prop.dist.contents" refid="dist.contents"/>
        <echo msg="prop.dist.contents: ${prop.dist.contents}" />
    </target>

</project>

Check files:

 $ phing tmp.test.files
Buildfile: /var/www/html/checkHookPlugin/build.xml
     [echo] source.root: /var/www/html/checkHookPlugin

tmp.testing > tmp.test.files:

     [echo] prop.dist.contents: src/plugins/check-hooks/autoload/MainAutoload.php;src/plugins/check-hooks/main/activate/ActivatePlugin.php;src/plugins/check-hooks/plugin-main.php

BUILD FINISHED

Total time: 0.1959 seconds

Check directories:

$ phing -f buildtemp.xml tmp.test.dirs
Buildfile: /var/www/html/checkHookPlugin/build.xml
     [echo] source.root: /var/www/html/checkHookPlugin

tmp.testing > tmp.test.dirs:

     [echo] prop.dist.contents: src/plugins/check-hooks/autoload/MainAutoload.php;src/plugins/check-hooks/main/activate/ActivatePlugin.php;src/plugins/check-hooks/plugin-main.php

BUILD FINISHED

Total time: 0.1916 seconds

Expected behavior
Only directories should be listed with DirSet

Screenshots / terminal output
See above

Additional context
This is using latest of phing/main.