All the properties connector icons from a node are distorted when any node is created, refer attached video

Steps to repro:
1 Create a new URP Template project.
2 Project Browser > Create > Shader > PBR Graph.
3 Open Shader Graph Window.
4 Create Node > Math > Basic > Add.
5 Any PBR Property connects to Add node Property.
6 Delete Add node.
7 Click on PBR Node Property.

Actual Result:
Property connector icon in a node is distorted

Tested With Package version:
7.1.6, 7.1.5, 7.1.1. 7.0.1

Expected Result:
Connector icons for Properties under nodes are clearly visible.

Reproducible in:
2020.1.0a17, 2019.3.0f4(91ed33c208f3), 2019.3.0b4.

Working fine in:
2019.3.0b3

Environment:
Windows 10 & macOS 10.14