Mesh Terrain does not create distance field so ground fog can't work

Summary

Mesh Terrain doesn’t seem to add a distance field necessary for things like ground fog, if I add old landscape it works but not on mesh terrain

What Type of Bug are you experiencing?

World Creation Tools

Steps to Reproduce

Create a level in 5.8.1 with mesh terrain add ground fog I use Uds, ground fog woes not appear, if you place any static mesh it will appear including the old landscape but not on mesh terrain

Expected Result

I expect mesh terrain to generate a distance field

Observed Result

Fron 2 days of testing with friends we seem to think ground fog does not generate distance field thus groung fog can’t work, it needs distance field

Affects Versions

5.8

Platform(s)

Windows