Display problem on tile view when participant terminal has no camera

To simulate the error, I have been created a conference which joined with 2 participants. One terminal has attached with camera, where another terminal does not installed with microphone & camera.
Participant with camera has no problem on default view/tile view switching.
However, for the participant with no mic and no camera, when switched to tile view, all participants displayed as black screen.

Please refer to the attached video for details