With the following xml test generated, the "duration" display in the web UI are random for the node a.b.c, and are correct for a.b.c.d:

<testsuites name="a.b.c" tests="90" failures="0">
<testsuite tests="2" failures="0">
<testcase classname="c.d" name="e" time="402.20">
<system-out>...</system-out>
</testcase>
</testsuite>
</testsuites>

The duration of all the testcase used to be sum automatically and display on the web interface for each node.
It's not the case anymore. And even if adding in the testsuite and the testsuites nodes a time attribute, it is not display, it's a random value which is display.