Mesh Terrain + RVT + Runtime PCG notworking in PIE

Summary

As the title says.
All looks ok in the viewport but as soon as I’d hit PIE, Runtime grass does not show up, RVT blending with Mesh Terrain does not show.

What Type of Bug are you experiencing?

World Creation Tools

Steps to Reproduce

Se summary.

Expected Result

Should look like the same as in Editor viewport.

Observed Result

See summary.

Affects Versions

5.8

Platform(s)

Windows