System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.74
Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Short description of error
Screen Space Reflections not working on material in which 2 shaders that include glossiness are connected to a Mix Shader when its factor is 1.0.
Exact steps for others to reproduce the error
- Enable Screen Space Reflections in EEVEE's rendered mode.
- Create a material that has 2 shaders (anyr shaders that have glossiness, like Glossy or Principled BSDF).
- Connect those two shaders to a Mix Shader node.
- When the factor of the Mix Shader is at 0, screen space reflections are visible. When the factor is at 1, they don't.
Including images to show the issue:
.blend file with an example (please, enable rendered mode and tweak the factor of the Mix Shader node to see the reflections):

