Operating system: Windows 7 SP1 64-bit
Graphics card: Geforce GTX 670
Broken: 2.80 Beta 2019-04-30 22:49
Short description of error
When mix two Subsurface Scattering node on Eevee, then result is broken and overexposed. Example: Mix two SSS node and set "Factor = 0", then result invalid, set "Factor = 1", result invalid, set "Factor = 0.5", result invalid, etc. etc.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).