XDomainBench: Diagnosing Reasoning Collapse in High-Dimensional Scientific Knowledge Composition. - Gong Zhiren; Tiantong Wu; Jiaming Zhang; Fuyao Zhang; Che Wang; Yurong Hao; Yikun Hou; Foo Ping; Yilei Zhao 001; Fei Huang 002; Chau Yuen; Wei Yang Bryan Lim (CoRR, 2026)