Using opera 117.0.5408.39,
I have a browser extension using Manifest V3, and the following code in a service worker:

chrome.notifications.create(
	"item-" + id,
	{
		type: "basic",
		iconUrl: img_url,
		title: title,
		message: description,
		priority: 2,
	},
	(notificationId) => {
		if (chrome.runtime.lastError) {
			console.error("Notification error:", chrome.runtime.lastError);
		}
	}

The part above works well, and the notifications get displayed. However, the following event listener never gets triggered:

chrome.notifications.onClicked.addListener((notificationId) => {
	console.log("notificationId", notificationId);
});

Testing it myself, I tried swapping the onClicked for onButtonClicked, without any luck.

It was reported to me by one of my user complaining that the feature "no longer works", so I am wondering if it's possible that Opera had a regression as my code has not changed.

My actual listener normally open a tab a specific URL, Opera appear to open a window with a blank tab in it and disregard the event listener entirely.