Render target "Auto Generate Mips" doesn't work

Development Rendering
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This issue definitely still persists in UE 4.19. This is, perhaps, the fastest way to reproduce this error:

  1. Create a “Strategy Game” from the game sample and open it
  2. Open the “MiniMapView” render target in the content browser and check “Auto Generate Mip”
  3. Run the game and shrink the editor window

Result: The minimap fades to black as you shrink the editor window!

Are there any news on whether this is likely going to be fixed in 4.20, or is this issue not a priority for the foreseeable future?