Java: Javadoc.getCommentedElement / Documentable.getJavadoc does not work for annotated elements

[Marcono1234]

Description of the issue
It appears Javadoc.getCommentedElement() respectively Documentable.getJavadoc(), to which it delegates, does not work for annotated elements.
Example query for demo projects on https://lgtm.com/query/lang:java/:

import java

from Javadoc javadoc, int javadocEnd, Documentable documentable, int documentableStart
where
  not exists (javadoc.getCommentedElement())
  and not isNormalComment(javadoc)
  and javadocEnd = javadoc.getLocation().getEndLine()
  and documentable.getCompilationUnit() = javadoc.getFile()
  and documentableStart = documentable.getLocation().getStartLine()
  and documentableStart < javadocEnd + 3
  and documentableStart > javadocEnd
select javadoc, documentable

Also note that there appears to be something weird going on, because when trying to exclude annotated elements from that query, it still finds them:

and not exists (documentable.(Annotatable).getAnAnnotation())

Though on the other hand checking not exists (annotation.getAnnotatedElement()) does not find anything.