Node properties do not display in the Inspector when its preset asset is selected before.

Steps to repro:
1. Create a new Project with HDRP template.
2. Project Window > Right Click > Create > Visual Effects> Visual Effect graph.
3. Open VFX graph > Select Initial Particle node > Create its preset.
4. Select newly created preset asset > Select Initial Particle node.

Actual Result:
Node properties do not display in the Inspector

Expected Result:
Node properties should be displayed in the Inspector.

Reproducible in:
2020.2.0a5 with 8.0.1, 2020.1.0b4 with 8.0.1, 2019.3.8f1 with 7.3.1,
2019.2.0f1 with 6.9.0, 2019.1.0f1 with 5.13.0, 2018.3.0a1 with 4.10.0

Note: Visual Effect Graph available from 2018.3.0a1.

Workaround: Select any other asset and then select the node, it will display the properties in th Inspector.

Environment:
Occurring on Windows 10 & Mac 10.15.