Looks like it might be related to this change, but we don't have a "linearize" node to solve the "problem" in a clean and easy way:
May 13 2019
I hope this helps...
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX TITAN/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.64
With Non-Color Data it works, but we get the need to copy the texture (becomes a big problem when the mix of textures grows).