CausalT5K: Diagnosing and Informing Refusal for Trustworthy Causal Reasoning of Skepticism, Sycophancy, Detection-Correction, and Rung Collapse. - Longling Geng; Andy Ouyang; Theodore Wu; Daphne Barretto; Matthew John Hayes; Rachael Cooper; Yuqiao Zeng; Sameer Vijay; Gia Ancone; Ankit Rai; Matthew Wolfman; Patrick Flanagan; et al. (CoRR, 2026)