After executing offline groovy script and configuring JBT/JBDS to use generated examples and maven repository, project examples are not shown in JBoss Central.
Warning is logged, when user tries to refresh "Start from sample" section (this one is from JBDS):

Invalid URL: http://download.jboss.org/jbosstools/examples/project-examples-jbds80.Beta3.xml

Groovy script has errors generating few examples (JBIDE-18582), but I think this is not relevant to this issue. What can be relevant is PR from JBIDE-18589 - switching descriptors from Beta3 to GA.