Why Texture memory 2D in RHI resource memory not equals ResExcKB of Texture2D in Obj List?

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According the result of memreport, I found Texture memory 2D in RHI resource not equals the memory of Texture2D obj, Could anyone tell me why?

  • 59644180 - Texture memory 2D - STAT_TextureMemory2D - STATGROUP_RHI - STATCAT_Advanced
  • Texture2D 548 102.75 102.75 54532.07 0.00 0.00 0.00 0.00 54532.07