https://cgit.kde.org/kirigami.git/commit/?id=944f8e8f3901781e355f0ef7c7d03c38abdb3877 changed the default timeout for PassiveNotifications to 7 seconds, which may still be too short to actually read some messages. Recommend increasing it to 10.
Actually, this isn't needed. We just need Bug 403809 to make sure you actually see it. Then 7 seconds is enough time provided the message is short. If it's not enough time, the message it too long and shouldn't be using a PassiveNotification in the first place.