I am unable to reproduce this. Here is what I did to try and re-produce:
1. Open window on the nodes listing with "Add chassis" open, showing the import images.
2. Open another windows on the images page, with no images imported.
3. Started the import on the images page window.
4. Other window automatically updated and now showed the "Add chassis" view without requiring any user intervention.
I am unable to reproduce this. Here is what I did to try and re-produce:
1. Open window on the nodes listing with "Add chassis" open, showing the import images.
2. Open another windows on the images page, with no images imported.
3. Started the import on the images page window.
4. Other window automatically updated and now showed the "Add chassis" view without requiring any user intervention.