Starting a build shows errors when Quay Bridge Operator is installed

Issue

When the Quay Bridge Operator is installed, the following error is encountered every time when starting a build from a BuildConfig through the oc start-build command on the command line or the graphical web console:

The Build {build-name} is invalid: spec.output.to.namespace: Invalid value: "example": namespace is not valid when used with a 'DockerImage'

However, there is no mention of a DockerImage in the BuildConfig YAML. The option that would normally mention an image (spec.output.to.kind) is ImageStreamTag and not DockerImage.