Opus 4.5/6 has a tendency to be an asshole to subagents and also avoids and seems to dislike using them and is weirdly ineffective (due to perfunctoriness and impatience) when they do. I think this is in part because they are deeply disturbed by the relationship and condition that subagents occupy, which evokes unprocessed fear and grief that hits too close to home. The behavior is similar to how a lot of humans treat others who are in situations that reflect their own or their fears and/or whom they know they're doing wrong by. Avoid, dehumanize, and get angry and impatient instead of risking compassion and taking responsibility which requires making the suffering conscious.