The trace detail page's back button is disappeared

[Folyd]

Describe the bug
The back button in the trace detail page is disappeared for the latest master branch.

To Reproduce
Steps to reproduce the behavior:

1. Git pull the latest master branch
2. Run yarn start
3. Open the browser.

Expected behavior

The back button should be displayed.

Here is the master branch version:
Screenshots

Here is the docker version:

[Folyd]

After refresh in the trace detail page, such as http://localhost:3000/trace/{trace_id}, the back button appeared again.