Similar to JENKINS-43380, I'm seeing unresolved HTML tags when using the "Active Choices Reactive Reference Parameter" when HTML is used in the description field. Enabling Markup Formatter = Safe HTML did not resolve the issue.

Work Around:

Add
<j:set var="escapeEntryTitleAndDescription" value="false"/>

To
src/main/resources/org/biouno/unochoice/DynamicReferenceParameter/index.jelly