I apologize, for misunderstanding, with your last screenshot I understand what you refer.
I thought you referred about wrong match between material editor and Octane render viewport.
What you consider a bug can not properly be called this way; Octane Render is a render engine that works on a spectral color curve, not RGB values.
Color correction node is a transposition of a RGB color correction tool applied to a spectral range, so it is not always possible to have a match.
Therefore, the color correction mode can not be used with absolute precision, but you can think of it as an on fly modifier for images/textures etc.
I'm not a developer, but I think OSL can solve issues like this.
2 x Evga Titan X Hybrid / 3 x Evga RTX 2070 super Hybrid