Viewer does not start when there is a sub-presentation in a layer

Edit: After further research, it seems that viewer cannot be opened when sub-presentation is in a layer.

Tested with Windows. Has to be tested with the attached project.

Test steps before the issue:
1. Create a new project 201903_subpres
2. Save and close the presentation
3. Create a new project 201903_subpres_left
4. Add some basic objects to the scene
5. Save and close the presentation
6. Open the project 201903_subpres
7. Go to Import Assets and import presentation 201903_subpres_left.uip
7. Add a new layer
8. Set 201903_subpres_left.uip as Sub-Presentation to the created layer
9. Run the project in viewer
-> Nothing happens. The viewer is not opened. No error message.