Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX TITAN X/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14
Broken: version: 2.83.4, branch: master, commit date: 2020-08-05 06:00, hash: rBc113af82881a
Short description of error
If you have a Shader that is converted with the Shader to RGB node, and then the resulting Color is plugged into another shader node and rendered, the output of Eevee's Color pass for that shader shows color plugged to socket of shader that is converted to RGB. In example file it is pure white, when you would expect to see the converted shader to RGB.
Problem exists with Diffuse, Glossy, and Emission shaders and passes with the exception that an Emission converted to RGB going into another Emission will show up properly in the emission pass.
Exact steps for others to reproduce the error
See Node graph in attached image, or attached file.