I think it’s just the way the extension works. Not really a list, but the extension is designed to click the decline link on anything that would lead to setting tracking cookies, like those notification requests.
An interesting thing to note is that I'm also seeing that my browser is asking whether to allow notifications from the site or not, rather than the site asking directly.
I'll have to do more testing. Ideally, I'd like to only use Adguard, since that's what I use across multiple devices. I'm sure I can find the filter list/settings that produce the same result as Ghostery... hopefully. LOL
Yes, it can be disabled, but what I'm saying is that with my previous addon setup, the browser message didn't even show up - only the website gave this popup about receiving notifications. In hindsight, it seems like broken browser behaviour, and it's working as it should now.