Xperia XZ2 touchscreen issue?

[Mitisadara]

After reading this forum regarding Xperia XZ2 touch issues, I decided to test my XZ2 touch screen. When I test it using service test (*#*#7378423#*#* >Service tests>Touch>Draw grid test), My touch screen never registers the bottom left and right edge grid. Does anyone have the same issue? Do I need to sent my phone for replacement? Here is the screenshot of the grid:

[980ctane]

Mine is the same. I think this is just the way the grid has been designed as in those small areas are not blocks that change colour.

To be sure can you try the test in Settings > Support > Tests > Touchscreen and make sure you can completely clear the screen.

Thanks