This is a regression introduced in 2018.3.0a10 and I managed to reproduced this int he current trunk (2019.1.0a4)

Repro steps:

- did Vegetation Studio from the asset store: https://assetstore.unity.com/packages/tools/terrain/vegetation-studio-103389
- open the Demo scene from: Assets\AwesomeTechnologies\VegetationStudioDemo
- click on the VegetationStudio obj in the hierarchy and select "Start Vegetation System"
- notice grass will render in the scene view, if you scroll close enough to the terrain
- press play and notice hte error and that no grass i rendering
Cannot repro with 2018.3.0a9 or older
- reproduced with 2018..30b4 and 2019.1.0a4
Regressed in 2018.3.0a10

On opening trying to upgrade this Asset Store package to the latest Unity Editor, this error prevents it from working (the grass will render int he Editor but not in Play Mode):

ArgumentException: ComputeBuffer.SetData() : Accessing 16384 bytes at offset 0 for Compute Buffer of size 10240 bytes is not possible.
UnityEngine.ComputeBuffer.SetData (System.Array data) (at C:/buildslave/unity/build/Runtime/Export/ComputeShader.bindings.cs:124)
AwesomeTechnologies.VegetationItemIndirectInfo.CreateComputeBuffer (System.Boolean useComputeShaders) (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationItemIndirectInfo.cs:127)
AwesomeTechnologies.VegetationItemIndirectInfo.UpdateComputeBuffer (System.Boolean useComputeShaders) (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationItemIndirectInfo.cs:196)
AwesomeTechnologies.VegetationCell.PostProcess (System.Boolean useComputeShaders) (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationCell.cs:245)
AwesomeTechnologies.VegetationSystem.Preprocess () (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationSystem_VegetationLoader.cs:89)
AwesomeTechnologies.VegetationSystem.UpdateVegetationInstanceLists () (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationSystem_VegetationLoader.cs:95)
AwesomeTechnologies.VegetationSystem.ExecuteRenderVegetation (System.Boolean forceRender) (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationSystem.cs:1835)
AwesomeTechnologies.VegetationSystem.Update () (at Assets/AwesomeTechnologies/VegetationStudio/VegetationSystem/VegetationSystem.cs:1732)