It may be fallacy to you because you haven't experienced it, but it has happened in my experience.
Sometimes on person describes an annoyance they have, and one of the other people in the room feels motivated to resolve that issue. Or a couple of people start talking about something, and a third person has a new idea that improves thing. There are endless scenarios that can result in something happening that otherwise might never have happened without the meeting.
This is a fallacy. If something really needs resolving, the setting is not relevant.