In https://github.com/jbosstools/jbosstools-base/blob/f38a27f16f5a0d5b0b11b9eae72df130cbad2e0c/stacks/plugins/org.jboss.tools.stacks.core/src/org/jboss/tools/stacks/core/model/StacksUtil.java#L65, the test should be archetypeId.equals(a.getId())

Latest stacks.yaml now has multiple archetypes with the same maven archetype id, but we're supposed to distinguish them via the stacks archetype Id. As a result, JBDS 7.1 will get the archetypes destined for JBDS 7.0, having the same maven archetype id.