[Forward port 2.16.2] Jackrabbit breaks <index-rule> with condition

To exclude HTML fields for a specific document type from being indexed, an <index-rule> element with a condition attribute was added to the indexing_configuration.xml.

  <index-rule nodeType="hippostd:html"
              condition="@element(mynamespace:comments, hippostd:html)/@jcr:primaryType='{http://www.onehippo.org/jcr/hippostd/nt/2.0}html'">
  </index-rule>

This works in Hippo 10.2.10 with Jackrabbit patch version 2.10.1-h16.

This no longer works in Hippo 10.2.11 with Jackrabbit 2.16.1-h1 (hence REPO-2026) , but also doesn't work in Hippo 10.2.12 with Jackrabbit 2.16.1-h2.

Apparently, the condition is not evaluated so all HTML fields are excluded from the index.