The following are known issues when using Unity 2018.3 to Author Content
- The new terrain system in 2018.3 is not yet fully supported. (works in 2018.2 and earlier)
- Uploaded trees may vanish
- Terrain textures may vanish
- Draw Instanced does not work
- SpeedTree 8 files (*.ST) are not yet supported.
- Some nested prefabs are giving issues after processing.
- Making some changes to an existing item's settings (such as cloth) may break the item's rigging, requiring remaking the item.