Rotating a static mesh makes it slightly smaller

If a static mesh is rotated 180 degrees, it is made slightly smaller than it usually is. There are some other degrees that can give the same effect without the shrinking, such as 540.

Regression?: No
This also occurred in 4.13, as far back as 4.11

1. Open the attached project
2. Open up NewBlueprint and look at the Viewport. Note that the two cubes are perfectly touching and there is no seam
3. In the Construction Script, set the Rotation on both Make Transform nodes to 0, 0, 180
4. Compile the blueprint
5. Look at the viewport again
   Result: There is a seam between the two cubes, causing a visible gap. The cubes have been made slightly smaller.
   Expected: The viewport looks the same and there is no seam.

[4.11] Rotating an Instanced Static Mesh Component by 180 Degree scales it smaller