The problem is that we prepare the bounding box on the update thread and then use it from the render thread. However for each viewport the bounding box should be different but we only store it in one variable (this used to be fine when both actions were performed from the same thread, but not anymore).
The problem is that we prepare the bounding box on the update thread and then use it from the render thread. However for each viewport the bounding box should be different but we only store it in one variable (this used to be fine when both actions were performed from the same thread, but not anymore).