System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.70

Blender Version
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-09-25 20:42, hash: rBee4707544904
Worked: (optional)

Short description of error
Shader Node Links (Noodles) disappear when object is selected AND clicking/hovering on Shader nodes.

Exact steps for others to reproduce the error
Starting with empty file.
Create Cube,
Create new Material -> No Noodles visible
Click on Cube in 3D View -> Noodles appear
Click on Shader Node or hovering over Node Input fields or hover over the sidescrollbar in the Nodeeditor -> Noodles disapear

Selecting the Cube in the Viewport and selecting the Cube in the Outliner also toggles the Noodles visibilty.