@iska @lispi314
It's just Fedi being Fedi — no guaranteed means of delivery. It takes days for some replies to appear in my notifications, while I can see them on the originating instance and can even look up from mine manually by using its full url. Sometimes I don't see my replies on the instance of the one whom I've been replying to.
In part it's my instance being laggy, but I think that's often the case in general 🤷