I just got a reply to my 3rd or 4th attempt to get some help from Opera with the problems I've been having. That's progress. There is someone there. Anyway, although their response is only a start, I did finally get their attention, and I'm grateful for that. Thank you, Opera for doing what you should have done the first time I asked.
Since {requireInteraction: true} is no longer a critical issue where the notification is not being displaying I would be ok with this being marked as resolved.
Since requireInteraction has no effect I would consider this a feature request instead for macOS. @kmielczarczyk Do you want me to open a new ticket for this a feature request and close this one as the bug being fixed?
@leocg I did. Searched for “disable animations”, “stop animations”, and so on. Maybe my choice of terms is wrong. Safari once had an extension called “Safari Stand”, I discovered it by chance, never would have come up with the term “stand” otherwise. Hence my asking.