Unity crashes after successful occlusion baking

I have a big Unity 32x32km terrain (made of four 16x16km terrains), and it takes a few hours for it to successfully finish baking the occlusion colliders, the smallest occluder being set at 50. Afterwards I can move around the visualization screen, move the camera, and see that everything works perfectly. But when the Occlusion Visualization is turned off, the editor is particularly slow, and when I hit play Unity crashes as soon as I move the camera.

I'm using HDRP 2.2.0 with Unity 2020.1.8f1. The baking is 80MB. Any help would be appreciated.