RPR 2.0.22 / Blender 2.80.49 / Windows 10 / Vega FE + Vega WX9100 + WX2990
Final render includes hidden objects (regardless of hidden collection or singular hidden object), however viewport preview render is indeed correct. Please refer to image below for clarity. The complete "blackness" is a volume domain box which is hidden. Initially rendered on Cycles, there was also fog in the scene.