When unchecking the Occlusion culling option in the project settings, if you place over 1.5k foliage meshes in the world, they stop rendering, the meshes are still present in the level and can be seen in wireframe mode, but are otherwise invisible. Erasing to a number under 1.5k allows the meshes to reappear. This issue is a regression.
4.16.3 - CL: 3561208 - Issue does not occur
4.17.1 - CL: 3586342 - Issue occurs
4.18 - CL: 3597901 - Issue occurs
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-49019 in the post.