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Inconsistent MultiIndex behaviour when indexing selects no rows

Inconsistent MultiIndex behaviour when indexing selects no rows: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). In my opinion, this behaviour is confusing and inconsistent. Preferably, both cases would throw KeyError .

The task

In my opinion, this behaviour is confusing and inconsistent. Preferably, both cases would throw `KeyError`.

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