This is by design. The scene contains 10 point lights and one spotlight. The reason for this issue is because there isn't enough space in the Shadow Atlas for all of these lights. Increasing the Atlas resolution and lowering the shadow resolution for each light can help but with this many lights this will always be a issue. Changing some of the lights to Spot Lights would also help.
It's in our backlog to offer an option for bigger shadow atlases and to improve the shadow atlas packing, which will help in these cases.