Operating system: Windows-10-10.0.16299 64 Bits
Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 416.34
Broken: version: 2.80 (sub 53), branch: blender2.7, commit date: 2019-03-31 21:52, hash: rBb936d7b16c62
Short description of error
The attached file was produced starting with a blank displacement texture then flood-filled with white in texture paint mode. The UV seams are visible in Eevee. They are visible in cycles render preview for the first few samples before fading away. This problem seems limited to the displacement texture. I did the same thing for the base colour, and no seams are visible.
Exact steps for others to reproduce the error
See problem in attached file. Sphere should be a completely smooth ball