Shadows in an asset's thumbnail disappear after opening and saving the asset, whether changes are made or not. 



Tested: 4.24.3 CL#11590370, 4.25P6 CL#12493028, 4.26 CL#12767035

Steps to Reproduce
  1. Create a project with Raytracing enabled and using DirectX12
  2. Open any static mesh asset
  3. Do not make changes, only press save and close the asset editor window
  4. Observe the thumbnail after saving the asset.

Result: The existing shadow in the asset's thumbnail will disappear.

Expected: The shadow to remain after saving and closing the asset.

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ComponentUE - Graphics Features - Lumen
Affects Versions4.
Target Fix4.27
Fix Commit15174217
CreatedApr 14, 2020
ResolvedJan 26, 2021
UpdatedSep 19, 2021
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