Landscape has a seam when scale is set to a decimal

Regression: Tested in UE5/Release-5.0 at CL 20979098, this issue does occur so it is not a regression.

This issue occurs if the scale set for the landscape has a decimal value that is not 0.5. Setting the scale to 0.5 (i.e 10.5, 50.5, 100.5) does not show a seam. Values between 0.1 to 0.4 and 0.6 to 0.9 do show a seam.

1. Create a new Empty level
2. Change to Landscape mode
3. Set the scale for X and Y to 10.4

Actual Result: Seam is visible in the landscape that splits it into 4 quadrants

Expected Result: No seam should be visible after creating the landscape