Dependency Ignored

A typical dependency (with version, scope, and exclusions set by parent POM via dependency management) shows up in the effective pom and the exported pom. However, it does not show up in the dependency tree in the debug output of an attempt to package the project, it doesn't show up in the resulting war (which it should by it's scope of runtime), and if it's deleted from the local repository, Maven does not attemtp to download it. Other project with this dependency specified the same way, with the same parent, download the dependency, and work as expected.