Regression with 1.2.1 trying to download artifacts which are part of the reactor

[olamy]

Affected version

1.2.1

Bug description

Use of cache in Jetty build, with 1.2.1 Maven is trying to download artifacts which are part of the reactor.
Possible cause #379

Caused by: org.apache.maven.project.DependencyResolutionException: Could not resolve dependencies for project org.eclipse.jetty:jetty-home:pom:12.1.5-SNAPSHOT
dependency: org.eclipse.jetty.ee11:jetty-ee11-home:zip:12.1.5-SNAPSHOT (compile)
	Could not find artifact org.eclipse.jetty.ee11:jetty-ee11-home:zip:12.1.5-SNAPSHOT in private-nexus (http://10.0.0.15:8081/repository/maven-public/)
dependency: org.eclipse.jetty.ee10:jetty-ee10-home:zip:12.1.5-SNAPSHOT (compile)
	Could not find artifact org.eclipse.jetty.ee10:jetty-ee10-home:zip:12.1.5-SNAPSHOT in private-nexus (http://10.0.0.15:8081/repository/maven-public/)
dependency: org.eclipse.jetty.ee9:jetty-ee9-home:zip:12.1.5-SNAPSHOT (compile)
	Could not find artifact org.eclipse.jetty.ee9:jetty-ee9-home:zip:12.1.5-SNAPSHOT in private-nexus (http://10.0.0.15:8081/repository/maven-public/)

while those artifacts are in the reactor