Jenkins: 2.46.2v
HipChat Plugin: 2.1.1

The hipchat jenkins job builder is out of date and causes "Notify room" check box unchecked when used with job builder for success notifications. However, the xml content generated by the job builder is deprecated by HipChat plugin.
E.g.
Jenkins job builder for hipchat generates the following xml:

<jenkins.plugins.hipchat.HipChatNotifier>
<token/>
<room>Filesystem Notifications</room>
<startNotification>false</startNotification>
<notifySuccess>true</notifySuccess>
<notifyAborted>false</notifyAborted>
<notifyNotBuilt>false</notifyNotBuilt>
<notifyUnstable>false</notifyUnstable>
<notifyFailure>false</notifyFailure>
<notifyBackToNormal>false</notifyBackToNormal>
<completeJobMessage>$JOB_NAME #$BUILD_NUMBER $STATUS after $BUILD_DURATION</completeJobMessage>
</jenkins.plugins.hipchat.HipChatNotifier>

The actual ones looks like this:

<jenkins.plugins.hipchat.HipChatNotifier plugin="hipchat@2.1.1">
<credentialId></credentialId>
<room>Filesystem Notifications</room>
<notifications>
<jenkins.plugins.hipchat.model.NotificationConfig>
<notifyEnabled>true</notifyEnabled>
<textFormat>false</textFormat>
<notificationType>SUCCESS</notificationType>
<color>GREEN</color>
<messageTemplate></messageTemplate>
</jenkins.plugins.hipchat.model.NotificationConfig>
</notifications>
<startJobMessage></startJobMessage>
<completeJobMessage>$JOB_NAME #$BUILD_NUMBER $STATUS after $BUILD_DURATION</completeJobMessage>
</jenkins.plugins.hipchat.HipChatNotifier>

The hipchat plugin has deprecated those xml attributes: https://github.com/jenkinsci/hipchat-plugin/blob/master/src/main/java/jenkins/plugins/hipchat/HipChatNotifier.java