use-of-uninitialized-value in xmlValidateRef

use-of-uninitialized-value in xmlValidateRef: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function xmlValidateRef in file libxml2/valid.c