"Create Delivery Pipeline version" errors

Steps to reproduce:

1. Create freestyle job and select the "Create Delivery Pipeline version" option (providing something like foo.${BUILD_NUMBER} in the Template field.
2. Create a matrix build, with one user-defined axis and one input string parameter.
3. Trigger the matrix build as a post-build step from the freestyle job, passing in the single parameter.

Although everything runs okay, jenkins.err.log will show several errors about skipping parameters.

{{Sep 08, 2016 9:03:26 AM hudson.model.ParametersAction filter
WARNING: Skipped parameter `INPUT` as it is undefined on `Sandbox/Matrix/Downstream/AXIS=64`. Set `-Dhudson.model.ParametersAction.keepUndefinedParameters`=true to allow undefined parameters to be injected as environment variables or `-Dhudson.model.ParametersAction.safeParameters=[comma-separated list]` to whitelist specific parameter names, even though it represents a security breach
Sep 08, 2016 9:03:26 AM hudson.model.ParametersAction filter
WARNING: Skipped parameter `PIPELINE_VERSION` as it is undefined on `Sandbox/Matrix/Downstream/AXIS=64`. Set `-Dhudson.model.ParametersAction.keepUndefinedParameters`=true to allow undefined parameters to be injected as environment variables or `-Dhudson.model.ParametersAction.safeParameters=[comma-separated list]` to whitelist specific parameter names, even though it represents a security breach}}