First time builds are not reporting to Bitbucket

I'm using this plugin with a Multibranch Pipeline for reporting the status of a build to Bitbucket. The issue I'm seeing is that the first time a branch is built, the status is not being sent. I can see in the log that it does call the plugin, but the log that says that posting the status succeeded does not show up. Each time a build is run after the first run works as expected.