I can also confirm that any changes made to 'Bump' or 'Corona Normal' (with a C4D 'Normalizer Shader' loaded) doesn't update in the IR. I have to restart my IR every time I make any updates to a bump or normal shader using the Node Editor. I haven't tried if it works without the Node Editor, but I'm using the Node Editor all the time now, so would of course be great if IR worked perfect with it.
If I use the 'C4D Layer Shader' (in the Node editor) and connect it to 'C4D Normalizer' (to convert a Black and White texture to a Normal Map) and then load this in the 'Corona Normal shader' then it doesn't work. If I delete the Layer Shader though, then the 'C4D Normalizer' works again and my textures are converted to normal maps that can be used in the 'Corona Normal shader'.
I am using the latest official Corona release on a Windows 10 workstation.