Perception Without Engagement: Dissecting the Causal Discovery Deficit in LMMs. - Jiafeng Liang; Zhihao Zhu; Zihan Zhang; Baoqi Ren; Shixin Jiang; Runxuan Liu; Tao Ren; Ming Liu 004; See-Kiong Ng; Bing Qin 001 (CoRR, 2026)