One Iteration Retrospective anti-pattern is when the team only brings up issues that are outside of their control to address, such as organizational policies, external dependencies, or stakeholder expectations. This can lead to frustration, helplessness, and cynicism among the team members, as well as a loss of focus on their own improvement opportunities12 (Must be taken from SAFe 6 Scrum Master resources) Reference:
Iteration Retrospective - Scaled Agile Framework
21 Sprint Retrospective Anti-Patterns | Scrum.org