After opening the category window from New VFX Graph, select any available properties (ex.AnimationCurve). On expanding selected property enable Exposed parameter while compiling assets causes the editor to freeze, Refer attached video

Steps to repro:
1. Create a new project
2. Windows > Package Manager > Visual Effects Graph > Install
3. Windows > Effects > Visual effect Graph > Create VFX Graph.
4. New Graph > (+) Button > Category > AnimationCurve property.
5. AnimationCurve property > Exposed(Enable it)

Actual Result:
Editor freezes on enabling the "Exposed" parameter in AnimationCurve property from New VFX Graph.

Expected Result:
After enabling Exposed parameter it should enable without encountering any issue

Reproducible in:
2020.2.0a8, 2020.1.0b6 with Package Version preview.13 - 9.0.0, 8.0.1

working fine in:
2020.2.0a8, 2020.1.0b6 with Package Version 7.3.1

NOTE:
1] Total of 37 properties having the Exposed parameter option available in VFX Graph
2] Visual Effect Graph is introduced in 2019.3.0a10.

Environment:
Only macOS 10.15