Combined Mesh in 2019.1

I'm currently experiencing a problem in 2019.1.0f2 where im seeing combined meshes despite having the Static Batching & Dynamic Batching flags switched off in player prefs.
The objects in question have Lightmap static & Reflection probe static marked but I didnt expect this to combine my meshes.

Is there something else I need to check.

Thanks.

 

Oops.

I was using a script called PrefabLightmapData (which is given on the forums as a workaround for the lack of ability to bake lightmaps in to prefabs) for adding lightmaps to my prefabs and this was calling StaticBatchingUtility.Combine.