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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-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm setting up a polymorphic relation where one parent owns many children of different concrete types — pretty much the canonical example from the…

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`).

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.