I upgraded Jenkins to 2.426.3.

After upgrade, there is "No changes from last build." message printed in changes tab of Jenkins job.

Even though Polling job is polled by scm change, I can not see changes in both status and changes tab. 

In api/xml page, there is 
<changeSet _class="org.jenkinsci.plugins.p4.changes.P4ChangeSet"/>
but I can not see <item _class="org.jenkinsci.plugins.p4.changes.P4ChangeEntry">
I tried with P4 plugin on both 1.13.3 version and 1.15.1 version.