Found issue with desert mountains not appearing with this mod. To fix this:

- Open the file with any text editor "TerrainStyle.artdef" (..steam/steamapps/workshop/content/289070/2361535448/ArtDefs/)

- Find the part:

<Element class="AssetObjects..ArtDefReferenceValue">
<m_ElementName text=""/>
<m_RootCollectionName text=""/>
<m_ArtDefPath text=""/>
<m_CollectionIsLocked>false</m_CollectionIsLocked>
<m_TemplateName text=""/>
<m_ParamName text="DesertMountainLayer"/>
</Element>

- Fill it like this:

<Element class="AssetObjects..ArtDefReferenceValue">
<m_ElementName text="Default"/>
<m_RootCollectionName text="DesertMountain"/>
<m_ArtDefPath text="TerrainStyle.artdef"/>
<m_CollectionIsLocked>false</m_CollectionIsLocked>
<m_TemplateName text=""/>
<m_ParamName text="DesertMountainLayer"/>
</Element>

- Save the file and it's fixed.