Playlist Folder Open-Arrow Not working (Mac)

[prinzmaus]

Spotify Version: 1.0.91.176.g78a5872a (Mac)

OS: High Sierra

Symptom:

The arrow at the end of a playlist folder does not open the folder. 

Steps to Repeat:

Rename a folder (it doesn't matter if you rename it, just trigger the edit function)

Choose the arrow at the end of any playlist folder.

Expected Behavior:

The arrow should open or close visibility to the playlists underneath.

Actual Behavior:

The arrow does nothing.

Workaround:

Restart Spotify. The arrows will work until the steps above are repeated.