Description

Volumetric lightmap holes appear every fifth build. 

Found in 4.19 CL# 4033788, 4.20 CL# 4302132, and 4.21 CL# 4348893

Steps to Reproduce
  1. Open the Editor
  2. Create an empty level
  3. Enable volumetric lightmaps
  4. Set detail cell size to 50
  5. Go to Show->Visualise->Volumetric Lightmaps
  6. Add some cubes and a static light
  7. Bake 5-10 times

Results:
The volumetric lightmap will have areas missing on the fifth build.

Expected:

No gaps would be in the lightmap.

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Unresolved
ComponentRendering
Affects Versions4.194.204.21
Target Fix4.22
CreatedSep 11, 2018
UpdatedOct 16, 2018