TeamCity build reporting no agents available

We are experiencing an issue where there are builds in our build queue reporting there are no agents available and indicating: `Wait reason: This build is waiting for the agent used for building its dependency.` This often occurs when the build agent that the dependencies were built on is in an idle state. 

Could this be due to the build dependencies between the builds?  We don't necessarily need them at the moment, since they can just run in sequence for the time being. Attached is a picture of the build chain for our project's build configurations.

Please let me know if there is any other information I can provide for clarity.