I noticed that when using a Multibranch Pipeline Job that will trigger a downstream Multibranch Pipeline job that contains the word "tags" in the name it can't find the item and fails to build.

Steps to reproduce:

1. Create Multibranch pipeline job named "blah"
2. Create another Multibranch pipeline job named "inventory-tags"
3. Create a Jenkinsfile in the blah pipeline that contains `
   build "inventory-tags/${env.BRANCH_NAME}"`
    

It should fail and say that it can't find it