All chains
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    CoreDescriptors: StorageDescriptor<
        [Key: number],
        {
            current_work?: {
                assignments: [
                    BrokerCoretimeInterfaceCoreAssignment,
                    { ratio: number; remaining: number },
                ][];
                end_hint?: number;
                pos: number;
                step: number;
            };
            queue?: { first: number; last: number };
        },
        false,
        "0",
    >

    Assignments which are currently active.

    They will be picked from PendingAssignments once we reach the scheduled block number in PendingAssignments.