Landscape Distance Fields artifacts when using DX12

This problem was reported in this UDN:
https://udn.unrealengine.com/s/question/0D52L00005PbEYNSA3/landscape-distance-fields-artifacts?fromCase=1

1) Launch QAGame with -dx12
2) Open ProcLandscape_Test.umap
3) Enable Show->Visualize->Global DistanceField

Observe random artifacts. The same are not there with DX11 or Vulkan. A quick look in RenderDoc reveals various horizontal and vertical lines in the source GlobalDistanceField<N> textures to the VisualizeMeshDistanceFieldCS shader. In DX11 these textures appear smooth.

[UE-23848] Bug Status

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