missing struts dependencies in 5.1 SDK. 5.0 & 4.0 OK

I followed the excellent Atlassian SDK tutorial and made a skeleton plugin for bamboo:

$ atlas-create-bamboo-plugin

....
[INFO] Sending event to Google Analytics: AMPS:bamboo - SDK First Run - 4.2.9
[INFO] determining latest stable product version...
[INFO] using latest stable product version: 5.1
[INFO] determining latest stable data version...
[INFO] using latest stable data version: 3.2.2
...

When I try to atlas-run I eventually get:

Missing:
----------
1) org.apache.struts:struts2-core:jar:2.3.15.1-atlassian-5

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.apache.struts -DartifactId=struts2-core -Dversion=2.3.15.1-atlassian-5 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.apache.struts -DartifactId=struts2-core -Dversion=2.3.15.1-atlassian-5 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) com.atlassian.bamboo.tutorial:helloworld:atlassian-plugin:1.0-SNAPSHOT
2) com.atlassian.bamboo:atlassian-bamboo-web:jar:5.1
3) org.apache.struts:struts2-core:jar:2.3.15.1-atlassian-5

2) org.apache.struts.xwork:xwork-core:jar:2.3.15.1-atlassian-7

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.apache.struts.xwork -DartifactId=xwork-core -Dversion=2.3.15.1-atlassian-7 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.apache.struts.xwork -DartifactId=xwork-core -Dversion=2.3.15.1-atlassian-7 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) com.atlassian.bamboo.tutorial:helloworld:atlassian-plugin:1.0-SNAPSHOT
2) com.atlassian.bamboo:atlassian-bamboo-web:jar:5.1
3) com.atlassian.bamboo:atlassian-bamboo-core:jar:5.1
4) org.apache.struts.xwork:xwork-core:jar:2.3.15.1-atlassian-7

----------
2 required artifacts are missing.

When I change the pom.xml to "5.0" or "4.0" everything goes great, I can load the bamboo plugin list and see my "helloworld" guy in there.