If there is any other information required, please let me know. Please see image and scene attached for comparison (including shader settings used) and a Blender scene with RPR and Cycles materials set up for you to debug. Other testers have provided results for RPR in C4D, as well as comparison images for C4D Standard and Octane Render however none of the latter exhibit this reflection behaviour, only ProRender in C4D does. For your convenience, I have tested the same settings (Black base colour, Metalness set to 1.0, Reflection Colour set to black and Reflection Roughness set to 1.0, disabled every other shader layer) on 5 different render engines: RPR, Cycles, LuxCore, Arnold and Pixar RenderMan 23.4, which I assume we can all agree is an industry-leading engine and therefore the best reference.
Summing it up as concise and clearly as I possibly can - using Metalness will result in a very bright tangent reflection/halo even when there realistically should not be one. Tested RPR 2.4 for Blender, RPR 2.9 for Maya, reproducible in every version so far, including C4D's latest Windows 10 2004, Threadripper 2990WX, 2x Radeon VII
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