Hi @shuhsien,
The plugin is conflicting with your theme or some other plugin. That does not mean that it is not compatible with WordPress 6.3.
If you check the screenshot that you sent, the error is at patterns.min.js and private-apis.min.js.
As I have mentioned before the plugin is compatible with WordPress version 6.3 and the new post editor. I have hundreds of instances where it is working fine. If you want to test it, I would request you to install a vanilla WordPress version 6.3 with the new post editor and try this plugin.
One of the reasons some other plugins conflict is that they keep some checks in their code for versions and when it doesn’t find it, it breaks. If you cannot change the theme or the other plugins, then you can disable the JS version removal feature and keep using this plugin.
Thanks & Regards,
Pankaj