Exception when promoting on a subgroup during configure.

z1.py

import numpy as np

import openmdao.api as om


class Burn1(om.Group):
    def setup(self):
        self.add_subsystem('comp1', om.ExecComp(['y1=x*2'], y1=np.ones(4), x=np.ones(4)),
                           promotes_outputs=['*'])

        self.add_subsystem('comp2', om.ExecComp(['y2=x*2'], y2=np.ones(4), x=np.ones(4)),
                           promotes_outputs=['*'])

    def configure(self):
        self.promotes('comp1', inputs=[('x', 'design:x')],
                      src_indices=[0, 0, 0, 0], flat_src_indices=True)

        self.set_input_defaults('design:x', 75.3)


class Phases(om.ParallelGroup):
    def setup(self):
        self.add_subsystem('burn1', Burn1(),
                           promotes_outputs=['*'])


class Traj(om.Group):
    def setup(self):
        self.add_subsystem('phases', Phases(),
                           promotes_outputs=['*'])

    def configure(self):

        # Excepton
        self.phases.promotes('burn1', inputs=['design:x'])

        # Works
        #self.promotes('phases', inputs=['burn1.design:x'])


prob = om.Problem(model=Traj())

prob.setup()
# builtins.RuntimeError: Phases (phases): The following group inputs, passed to set_input_defaults(), could not be found: ['burn1.design:x'].

prob.run_model()