Steps to reproduce the issue

Execute the disconnectedCallback of the toolbar button custom element

Expected result

No js errors in the console

Actual result

Failed to execute 'removeEventListener' on 'EventTarget': 2 arguments required, but only 1 present

The disconnectedCallback function has the following and incomplete call to removeEventListener, it should be either removed or attached to a proper event handler passed in as the second argument:

this.removeEventListener('click');

System information (as much as possible)

Joomla 4 Alpha 8