@article{
wang2026when,
title={When {LLM} Reward Design Fails: Diagnostic-Driven Refinement for Sparse Structured {RL}},
author={Youting Wang and Yuan Tang and Bowen Liu and Xuan Liu and Dingyan Shang},
journal={Transactions on Machine Learning Research},
issn={2835-8856},
year={2026},
url={https://openreview.net/forum?id=5TmwBBn8Oh},
note={}
}