Building mesh terrain with transform produces untranslated actors.

Summary

After building mesh partition a mesh terrain that was translated will produce actors that are not translated. This happens even with the default setup at random to either collision or visual mesh actors.

What Type of Bug are you experiencing?

World Creation Tools

Steps to Reproduce

  1. Create an empty WP level.
  2. Switch to Mesh Terrain mode and create a default terrain rectangle.
  3. Before hitting Accept move it a bit to have a non-zero transform.
  4. Build Mesh Partition.
  5. Start Play In Editor.

Extra steps (if bug does not occur immediately):
6. Stop PIE and Build Mesh Partition again without changing anything.
7. Start Play In Editor.
8. Repeat.

Expected Result

Both visual and collision terrain actors are properly translated to match the preview in editor.

Observed Result

At random one of the visual or collision meshes doesn’t get proper translation.
Rebuilding mesh partition changes randomly which part is bugged.

Affects Versions

5.8

Platform(s)

Windows

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Additional Notes

Editor Preview actors are fine. This only affects runtime.