Typescript: Wrong return type when using lean in different way

Typescript: Wrong return type when using lean in different way: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). it's: ts // ^? const a: (mongoose.Document<unknown, {}, { name: string; } & { name: string; } & { id: mongoose.Types.ObjectId; }) null