Inattentional blindness facilitates idea stealing (or misattribution of credit) in meetings.
Summary: https://phys.org/news/2025-03-attention-limitations-idea-thieves-workplaces.html
Original paper: https://www.nature.com/articles/s41598-024-56905-6
From uncounted meetings over decades, I would say there are two contributing factors: 1) repetition; and 2) clarity and conciseness in presentation of the idea.