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Polymorphic children are not loaded correctly when hydrating a parent

Polymorphic children are not loaded correctly when hydrating a parent: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). I'm setting up a polymorphic relation where one parent owns many children of different concrete types — pretty much the canonical example from the README…

The task

I'm setting up a polymorphic relation where one parent owns many children of different concrete types — pretty much the canonical example from the README (something like an Owner that has many Pet records, where Pet can be a Cat or a Dog). My setup looks roughly like this: Then…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.