Double arrow when selected list item

[sophiiss]

When select folder item from left panel list, double dropdown arrow appears

Reproduction Steps:

1. Click some folder on left panel

Expected behavior:

Only one dropdown arrow appears

Observed behavior:

Two dropdown arrow appears

Screenshots and GIFs

https://i.imgur.com/hGMaHYU.jpeg

Atom version: 1.55.0
OS and version: Windows 10 Home 20H2 x64

Installed packages:

Only atom-material-ui and the dark syntax