Is the person who wrote the tweet trolling? Probably not either.
But what type of iOS device do they have? Which version of iOS are they running? Which language and locale?
Those things matter. Other things that apparently shouldn't matter might matter as well: other apps installed or running, notification configuration, how many tabs they have open, whether they're connected via WiFi or 4G, etc.
We don't know any of that stuff. As GP said: better reproduction steps needed.
As it is this bug report is barely above the kind of "hurr durr it dern't work" support ticket that really pisses off everyone in my team, and indeed every support engineer, and software engineer I've ever worked with.