Variable interpolation not working .. sorta...!

We’re seeing this on Ansible 1.8.2. Here is a snippet from the run of a play

TASK: [marathon_app | Update Bamboo record for {{ app_id }}.{{ domain }}] *****

Notice how two variables are not printed properly – these two variables are specified and the play fails without them. However, they are not “interpolated” correctly. Has anyone else seen this before?

task names will not resolve variables at a certain scope, as the task
name needs to be the same for all hosts.