Profiler not showing GPU usage "to" and "from" calls in show calls section while clicking on samples.

Steps to repro:
1. Open _Complete-Game scene from the attached project.
2. Go to Windows > Profiler.
3. Add Profiler "GPU" > Select "GPU Usage".
4. Enable Record, Deep Profile and Profile Editor.
5. Add Show Calls > Play Scene > Select any Sample from Overview.

Actual Result:
Show calls tab not showing calls "to" and "from".

Expected Result:
Show calls tab should shows "Calls to" and "Called from".

Reproducible on:
2018.2.0a7, 2018.2.0a6, 2018.2.0a4.

Working fine on:
2018.2.0a3, 2018.2.0a1, 2018.1.0b13.

Environment:
Occurring on Windows and Mac.