Some versions of N&N don't contain other versions in the left-hand side menu

This is a followup of JBIDE-24529.

Notice that this page contains all the versions in the left-hand side menu:
https://tools.jboss.org/documentation/whatsnew/jbosstools/4.5.0.AM2.html

Then try different versions:
https://tools.jboss.org/documentation/whatsnew/jbosstools/4.5.0.AM1.html
https://tools.jboss.org/documentation/whatsnew/jbosstools/4.4.4.Final.html

Those are still ok.

But then try this:
https://tools.jboss.org/documentation/whatsnew/jbosstools/4.4.3.Final.html
Suddenly you only see one version in the menu. Why is that?

It seems that all the versions with a label (Coming Soon, Development or Stable) work correctly, whereas those without a label will only show their version when clicked and all other versions will disappear.

It seems like a bug.