Landscape Spline meshes lose vertex color paint after moving to another level

UDN:

https://udn.unrealengine.com/questions/432735/%E5%9C%A8%E6%B5%81%E5%85%B3%E5%8D%A1%E4%B8%AD%E6%8F%8F%E7%94%BB%E6%A0%B7%E6%9D%A1%E6%9B%B2%E7%BA%BF%E4%B9%8B%E5%90%8E%E5%A6%82%E6%9E%9C%E6%8A%8A%E5%9C%B0%E5%BD%A2%E7%A7%BB%E5%8A%A8%E5%88%B0%E6%B5%81%E5%85%B3%E5%8D%A1%E4%B8%AD%E7%9A%84%E5%85%B6%E5%AE%83%E5%85%B3%E5%8D%A1%E5%90%8E%E6%A0%B7%E6%9D%A1%E6%9B%B2%E7%BA%BF%E4%B8%8A%E7%9A%84%E6%8F%8F%E7%94%BB%E6%95%88%E6%9E%9C%E4%BC%9A%E6%B6%88%E5%A4%B1.html

1. Open QAGame in UE Editor
2. Open the level A
   • Located at: _Content/Maps/Tools/Landscape/UE-59007
3. From the Main Toolbar, select Modes > Mesh Paint
4. Select the cube in the level
5. Paint on the cube
6. From the Main Toolbar, select Modes > Landscape
7. From the ribbon beneath the Main Toolbar, select Manage > Move to Level
8. In the bottom-right corner of the Viewport, select the Current Level dropdown
9. Set the current Level to B
10. In the viewport, select the Landscape Component beneath the cube
11. With Splines active, select the control point above the Cube
12. Translate the control point