UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
(Note: I've attached an example extension that takes care of these steps. After installing it, launch the devtools panel and navigate to the "Button-test" tab)

1. Create a devtools extension. 
2. Call chrome.devtools.panels.create() with appropriate args.
3. In the callback provided to function in prior step, call panel.createStatusBarButton() with a button image that contains the active and inactive  as described in devtools extension api docs (https://developer.chrome.com/extensions/devtools_panels#type-ExtensionPanel).

What is the expected behavior?
When the user clicks on the button, the button display should toggle to the right-hand side of the provided image.

What went wrong?
The right-hand side of the button image is never displayed and the user receives no feedback that the button is in a pressed state. It looks dead.

Did this work before? N/A 

Chrome version: 67.0.3396.99  Channel: stable
OS Version: ubuntu 16.04
Flash Version:
 

Deleted: test_devtools_button.zip 7.2 KB

test_devtools_button.zip 7.2 KB Download