Manual image transformation: Losing top of the image

With LR3 I often use the manual image transformations and observe an undesirable effect, which I cannot explain to myself: When changing the Vertical Perspective to a negative value, the image will be transformed to cope with the perspective as intended, but its top will be shifted out of sight as well. For example, when correcting the image of a tall building, the top of its tower shifts out of sight. An example:
After applying vertical correction -33 it looks like this:
The entire top of the tower is gone, on the bottom though we see the "out of image" area, and we cannot shift the image downward to see the top of the tower rather than the "gray" on the bottom. I found no way to avoid this, until I discovered that I can change the scaling factor (while losing the resulting image resolution :-() and than this missing part of the image will be visible again.
Once we scale to 84% the above image, we can see the top of the tower again. Of course, we can crop out the gray areas manually:
However, the pixel size of the image is really reduced proportionally to the scale factor, here 0.84.
Why is that so? I am almost convinced, its a bug.
Thomas

I would not be too worried about losing resolution etc.
If you do a lens correction like the one in the example of the "leaning tower", it is "major surgery" mo matter if you do it in LR or PS.
The top of the image gets enlarged while the bottom stays the same size.
You can think of this kind of lens correction as an image enlargement through a gradual filter that runs vertically.
As enlargements always do, it degrades image quality.
If you are concerned about retaining max image quality, in my opinion it's best to stay away from correction of lens distortion.
But I realize, sometimes we don't have that choice.
WW

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Message was edited by: karthiIndesign

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Manual image transformation: Losing top of the image

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