Post Action not Sending Despite 'When' Condition Passing

For those who might happen upon this thread, the underlying issue is that the API Connector is overriding my dynamic parameter “cookie” with the testing value defined in the parameter definition section of my API definition.

The debugger is also showing me a request body which includes the proper dynamic values, prior to this value being overwritten, and the request being sent.
For this, I have created a more focused thread, where I hope to receive a solution or at least draw attention to the bug in the debugger.

If you believe you are having a related issue, please see the above thread.