Rotating an instanced static mesh

Changing the rotation of an instanced static mesh by 90 or 180 degrees creates a small space in between meshes. 

1. Create a new 4.23 project
2. Create Actor Blueprint
3. Set up the construction script of the actor blueprint the same as the attached image "Constructor_Setup"
4. save/compile
5. Place the actor into the level and set "Translate X" to 100 and "Rotate Z" to 90 degrees
6. Zoom in on the actor

Results: A small space appears between the two meshes

Expected: There to be no space when the rotation is set to positive/negative 90 or 180.