SOLVED Grass items sudden pop in...Something to do with occlussion culling?

Hello, in the video you can see how even when close to camera patches of grass still pop in and out suddenly. Also, hard to notice but sometimes you have a white sphere flash randomly on the screen.

I thought the grass might be due to dynamic occlusion on the mesh renderers, but that didn’t sseem to have an effect. I’ve also fiddled with draw distance and LOD distance of grass prefabs to no good effect. Is there perhaps a limit somewhere to how many instances can be drawn at a time?

I am in 2019.2 by the way, and these grass prefabs are being drawn with instanced indirect via Vegetation Studio pro.

https://i.gyazo.com/e66f74bdc1a4270445a8450a3ad9729a.gif

maybe this means sosmething. This one grass object dissappears and reappears at specific distance. Why just this one random instance?

SOLVED

Vegetation studio has a sneaky little parameter called Distance Falloff that I had inadvertently ticked. The weird thing is that it seems to make things falloff at random distances, but whatever.