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Numerous problems with Eevee and new Bump Map
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Description

System Information
Intel Core i7, 16 Gb RAM, NVidia GeForce RTX 2070
Windows 10 x64

Blender Version
Broken: 2.81 54a9649e2636 from 2019-10-06
Worked: 2.81 f3a4f12ac090 from 2019-09-08

Short description of error
As far as I can see, something was changed in Blender Bump and it looks like that change introduced numerous problems:

  1. Lights behave very strangely and look wrong. Notice the wrong hightlight and lack of shading on the left side of the plane.
  2. Mixing shader nodes became problematic - in some cases mixed material becomes significantly darker and sometimes Bump stops working on large Height values.
  3. Overly darkened Ambient Occlusion where objects with Bump visually or physically overlap each other.
  4. Contact Shadows doesn't seem to work in some cases.

And several other assorted problems.

Exact steps for others to reproduce the error
Take a look at my render or open provided test file and set it to Rendered view.


Details

Type
Bug

Event Timeline

can confirm the error, using 40a55be82cf5 win 7 x64 - gtx 1070 Drv: 430.86

Germano Cavalcante (mano-wii) lowered the priority of this task from Needs Triage by Developer to Confirmed, Medium.

I can confirm that the result of the bump in the attached file matches better Cycles in Blender 2.80

The issue is caused by the texture being used by the bump tree and the rest of the tree. Digging deeper...