What could be the cause of a line of pixels highlighted in the image below? All positions should match perfectly. It seems to be at certain angles, but it's also in the animation render.
Here are block positions.
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Combining cubes together so they are touching is not the best flow to make a mesh. If my suggested fixes didn't help I suggest using Extrude tool when creating a single more complicated mesh.
Select a face
Then use combination
2 to extrude it up by 2 units
Select the side face
You will end up with a single object with a single mesh (and no islands) that renders correctly.
When animating simply use this mesh for static shots, and when things need to move just hide it, and use your separated meshes.
Issue seems to be visible only in Eevee rendering engine.