Properties dropdown icon direction is not changing on expanding and collapsing from Blackboard under "New Shader Graph" window, refer attached video

Steps to repro:
1. Create a new project
2. Windows > Package Manager > Shader Graph > Install
3. Project Window > Create > Shader >PBR-Graph
4. Open "New Shader Graph" from Project Window
5. Add "Properties" from Blackboard under New Shader Graph

Actual Result:
Properties dropdown icon does not change its direction on expanding and collapsing

Expected Result:
Properties dropdown icon change its direction on expanding and collapsing

Reproducible in:
2020.1.0a7, 2020.1.0a6

Working fine on:
2020.1.0a5, 2019.3.0b6

Package version found: 7.1.2, 7.1.1, 7.0.1

Environment:
Windows 10 & macOS 10.14