Latest git on Arch Linux using Awesome WM with dualscreen setup

When Kdenlive finishes rendering an audio thumbnail, the message does not go away, leading to believe one of:
1. audio thumbnail hasn't started yet (there's no progress bar on the right)
2. audio thumbnail is being rendered but progress bar is missing
3. audio thumbnail rendering is broken

https://youtu.be/YbL-LJWc44M

Reproducible: Always

Steps to Reproduce:
Import a new video (known videos' thumbnails are preserved) and wait until audio thumbnail rendering finishes

Actual Results:  
The message persists

Expected Results:  
The message should disappear or be replaced with "Finished audio thumbnail rendering for ..."

Not a problem if you know the issue but possibly worrying for unfamiliar users.