There is an issue with WordPress 6.6 seemingly related to wp-scripts and browserslist that's preventing the JS for Byline Manager from working properly.
Steps To Reproduce
Upgrade to WordPress 6.6 RC3 or later
Observe that Byline Manager scripts are throwing errors and functionality is not available in the editor
Description of the bug
There is an issue with WordPress 6.6 seemingly related to wp-scripts and browserslist that's preventing the JS for Byline Manager from working properly.
Steps To Reproduce
Additional Information
https://github.com/WordPress/gutenberg/issues/62923#issuecomment-2221333719