revapi: Problems when converting to revapi.differences

On XWiki I tried to upgrade to revapi-java 0.22.1 and revapi-maven-plugin 0.12.2 and I’ve used for example:

      <plugin>
        <groupId>org.revapi</groupId>
        <artifactId>revapi-maven-plugin</artifactId>
        <configuration>
          <analysisConfiguration>
            <!-- Add ignores here using the following syntax. You can use a single <revapi.differences> entry but it
                 cannot be empty. You can also use different  <revapi.differences> entries if you wish to use a common
                 justification for example.

                 Note: you can use regexes by using the syntax: <regex>true</regex>
                 Don't forget to '\'-escape dots and other special characters in this case ;)

                 <revapi.differences>
                   <justification>This change is necessary to fix bug #1234</justification>
                   <criticality>hightlight</criticality>
                   <differences>
                     <item>
                       <code>java.method.addToInterface</code>
                       <fullQualifiedClassName>com.acme.ToolInterface</fullyQualifiedClassName>
                       <new>method void com.acme.ToolInterface::setup()</new>
                     </item>
                     <item>
                       <code>java.method.removed</code>
                       <fullQualifiedClassName>com.acme.ToolInterface</fullyQualifiedClassName>
                       <old>method void com.acme.ToolInterface::initialize()</old>
                       <justification>...</justification>
                     </item>
                   </differences>
                 </revapi.differences>
            -->
            <revapi.differences>
              <differences>
                <item>
                  <code>java.method.removed</code>
                  <old>method void org.xwiki.diff.xml.XMLDiff::xxx()</old>
                  <justification>Unstable API added by mistake.</justification>
                </item>
              </differences>
            </revapi.differences>
          </analysisConfiguration>
        </configuration>
      </plugin>

When executing it I got:

[INFO] --- revapi-maven-plugin:0.12.2:check (revapi-check) @ xwiki-commons-diff-xml ---
[INFO] Comparing [org.xwiki.commons:xwiki-commons-diff-xml:jar:12.10] against [org.xwiki.commons:xwiki-commons-diff-xml:jar:13.0-SNAPSHOT] (including their transitive dependencies).
[WARNING] The `revapi.reclassify` extension is deprecated. Consider using the `revapi.differences` instead.
[WARNING] The `revapi.ignore` extension is deprecated. Consider using the `revapi.differences` instead.
[INFO] API problems found.
[INFO] If you're using the semver-ignore extension, update your module's version to one compatible with the current changes (e.g. mvn package revapi:update-versions). If you want to explicitly ignore these changes or provide justifications for them, add the xml snippets to your Revapi configuration for the "revapi.differences" extension.

<item>
  <code>java.method.removed</code>
  <old>method void org.xwiki.diff.xml.XMLDiff::xxx()</old>
  <justification>ADD YOUR EXPLANATION FOR THE NECESSITY OF THIS CHANGE</justification>
</item><item>
  <code>java.method.removed</code>
  <old>method void org.xwiki.diff.xml.XMLDiff::xxx()</old>
  <justification>ADD YOUR EXPLANATION FOR THE NECESSITY OF THIS CHANGE</justification>
</item>

It seems to me that there’s a duplicated difference listed, no?

Also I’m not sure why but it seems my <revapi.differences> has not been taken into account. Note that we also have https://github.com/xwiki/xwiki-commons/blob/13bcf8d73d2cd6991e3cbcbc85eb4a3ab4673dc8/xwiki-commons-tools/xwiki-commons-tool-verification-resources/src/main/resources/revapi.json configured. Could it be that we cannot mix revapi.ignore with revapi.differences?

Thanks!