Build Configurations created using REST API are removed shortly after

Hi,

We send POST requests to /app/rest/buildTypes to create two Build Configurations in an existing project. We then use a PUT to the parameters href of the first created Build Configuration so that we can set a parameter linking it to the second Build Configuration.

So the timeline is:

1. POST to create Build 1
2. POST to create Build 2
3. PUT to set parameter on Build 1 to reference the id of Build 2

This all works fine and I can see the builds in the TeamCity UI.

The problem is that a few minutes later the new Build Configurations are no longer present. TeamCity has removed them.

I'm not sure if this is relevant but our _Root project has its Versioned Settings synchronized with a TFS VCS Root and all other projects are set to "Use settings from a parent project".