It's a "feature" which will probably generate a "working as intended" response. On a more serious note how would you want it fixed? I mean would you want both lasers to continue running, or would you prefer that they both shut down? There's pros and cons either way.
Now if you want a real bug, how about how mining lasers sometimes forget to move ore to the cargo hold and result in you occasionally getting yields by the time you shut the lasers off manually that on a per laser basis exceed your ship's cargo capacity.