Groups & ExcludedGroups are ignored after first Ant-based test is run

[gszura]

ant config file (only important parts):

[...]
<target name="testNG-smoke">
    <testng groups="smoke"
            excludedgroups="broken, not-implemented"
            outputdir="${testNG.reports.dir}"
            classpathref="testNG.run.classpath">
        <xmlfileset dir="${testNG.config.dir}" includes="testng.xml" />
    </testng>
</target>
[...]

---

TestNG config file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite">
<test name="test set 1" preserve-order="false" verbose="5">
    <packages>
        <package name="xxx.xxx.xxx.set1.*" />
    </packages>
</test>
<test name="test set 2" preserve-order="false" verbose="5">
    <packages>
        <package name="xxx.xxx.xxx.set2.*" />
    </packages>
</test>
</suite>

---

Now when calling "testNG-smoke" ant target, information about included and excluded groups is used by TestNG while running tests from "test set 1", but they are ignored while running tests from "test set 2", so instead of tests from particular group only, all available tests are executed - from logs:

[...]
[testng] [TestRunner] Running test test set 1 on 62 classes, included groups:[smoke ] excluded groups:[broken not-implemented ]
[...]
[testng] [TestRunner] Running test test set 2 on 28 classes, included groups:[] excluded groups:[ ]
[...]

Last time it was working fine on TestNG 6.0.1.

I've found similar issue here, reported 4 years ago: http://jira.opensymphony.com/browse/TESTNG-194
This one most probably describe the same issue: #69