Artifacts at seams between meshes in Unity in isometric camera only

I’m trying to piece together some very simple placeholder models that I intend to use as tiles in Unity and I’m seeing odd pixel artifacts along the seams of the tiles that only show up when using an isometric camera. You can see them in this image.

Example of isometric artifacts

And the same geometry but just from a perspective camera shows no artifacts.

Example of perspective with no artifacts

I verified that the two models are exactly aligned right along the seam by checking the actual vertex data. The artifacts are dependent on the camera itself and shift along the seam as the camera is panned and zoomed.

I’ve disabled shadows, set the texture filter mode to point, disabled mipmap generation

The geometry is quite simple and is imported from the OBJ file below.

# normals vn -1 0 0 vn 1 0 0 vn 0 0 1 vn 0 0 -1 vn 0 -1 0 vn 0 1 0  # texcoords vt 0.970703 0.5 vt 0.974609 0.5  # verts v 0 2 0 v 0 2 -4 v 0 2.3 0 v 0 2.3 -4 v 0 2.5 0 v 0 2.5 -4 v 4 2 0 v 4 2 -4 v 4 2.3 0 v 4 2.3 -4 v 4 2.5 0 v 4 2.5 -4  # faces f 3/2/1 2/2/1 1/2/1 f 4/2/1 2/2/1 3/2/1 f 5/1/1 4/1/1 3/1/1 f 6/1/1 4/1/1 5/1/1 f 7/2/2 8/2/2 9/2/2 f 9/2/2 8/2/2 10/2/2 f 9/1/2 10/1/2 11/1/2 f 11/1/2 10/1/2 12/1/2 f 7/2/3 3/2/3 1/2/3 f 9/1/3 5/1/3 3/1/3 f 9/2/3 3/2/3 7/2/3 f 11/1/3 5/1/3 9/1/3 f 2/2/4 4/2/4 8/2/4 f 4/1/4 6/1/4 10/1/4 f 8/2/4 4/2/4 10/2/4 f 10/1/4 6/1/4 12/1/4 f 2/2/5 7/2/5 1/2/5 f 8/2/5 7/2/5 2/2/5 f 5/1/6 11/1/6 6/1/6 f 6/1/6 11/1/6 12/1/6 

With the following texture applied as Albedo on a default Unity material (a bit odd since it was originally generated in MagicaVoxel)

Texture

I’m really at a loss for what could be causing these to show up. Only spotted them because I was testing an outline shader and it was outlining all the artifacts as the normals on those pixels were odd. With a pixel shader set to display _CameraNormalsTexture instead of the color the artifacts are still visible as variances in the normals as you can see in the image below.

Same image but of camera normals

Ubuntu seams to not free ram memory

i am using Ubuntu 19.04 in laptop with 12 GB of ram when i start the system everything is fast and responsive, and currently memory usage is about 1.5 up-to 2 gb of my ram occupied.

Then if i start heavy programs like android studio with emulator it take about 5 gb of ram and it running everything fast and smooth but after 2-3 hour of work still with same opened applications in the beginning memory is almost full and system is using swap file and everything get so slow. even after closing all programs systems remain slow.

PS:I asked some of my friends, which the have same issue some with like Vmware and heavy programs.