Terrainlayer GUIDS cannot be extracted from AssetBundle

Hello,

Recently did an upgrade to 2018.3 and am running into an odd issue with terrains. My game is structured so that users can build their "world" in a separate project and then create an asset bundle for the scene. The scene is then loaded into the main program for display.

My problem is that once I create my asset bundled world (simple project using "FantasyEnvironments" terrain), upon downloading and additively loading it in the main game, the layers do not show up. In the console view I have the following errors:

Could not extract GUID in text file Assets/_TerrainAutoUpgrade/layer_ground_grass(3.000,3.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000.terrainlayer at line 10.
Could not extract GUID in text file Assets/_TerrainAutoUpgrade/layer_ground_road(3.000,3.000)(0.000,0.000)(0.000,0.000,0.000),0.000,0.000.terrainlayer at line 10.

The GUIDs in the two files are all 0s.

I have confirmed that the world will load in it's own project without issue.

Any one have any ideas or have run into the same problem?

Thanks,
Cody