On enabling "Exact Fixed Time" Update Mode in the Inspector of "New VFX" Graph causes the Editor to throw "Thread group size must be above zero" error continuously, Refer attached video.

Steps to repro:
1. Create a new HDRP template project
2. Project window > Create > Visual Effects > Visual Effect Graph
3. Inspector > Update Mode > Exact Fixed Time > Enable

Actual Result:
"Thread group size must be above zero" is thrown continuously on enabling "Exact Fixed Time" Update mode

Expected Result:
No errors in the console.

Note: "Exact Fixed Time" Update mode is introduced in the VFX package 8.1.0

Occuring in:
2020.2.0a20, 2020.2.0a1, 2020.1.1f1 with Package version 10.0.0-preview.27, 9.0.0-preview.33, 8.2.0, 8.1.0

Environment:
Occurring only on Windows 10