[Bug report] Auto Mapper report

there seems to be a bug in the Auto mapper. When you put ur tiles all the way out to the sides..
Lets say the map was 60 x 60 big..
And you put standard tile in the bottom like ground..
Which will look like this
The S' is the ground
|------------------------------|
|                                      |
|                                      |
|                                      |
|                                      |
|                                      |
|                                      |
|SSSSSSSSSSSSSSSSSSS|
|SSSSSSSSSSSSSSSSSSS|
And you put it all the way out to the sides..
5x big and 60x width
And hit automap..
The Auto mapper skips the 2 sides.. 1 and 60.
and the bottom 60 down
It will look like this:
X indicates standard tile.
|------------------------------|
|                                      |
|                                      |
|                                      |
|                                      |
|                                      |
|                                      |
|XSSSSSSSSSSSSSSSSSX|
|XXXXXXXXXXXXXXXXXXX|

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