When mip gen settings on a texture array is changed, the texture does not build properly.

Steps to Reproduce
  1. Download attached project
  2. Open the texture TA_Top_Inset_N
  3. Change the mip gen settings to "FromTextureGroup"

Result: The texture array does not build correctly


Expected: A mip chain is properly generated for every texture in the array

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Affects Versions4.24.14.25
Target Fix4.25
CreatedDec 27, 2019
UpdatedJan 9, 2020