Help using generics and maps

private final Map<Class<? extends ClientPacket>, PacketConsumer>[] listeners = new Map[5];

public <T extends ClientPacket> void setListener(@NotNull ConnectionState state, @NotNull Class<T> packetClass, @NotNull PacketConsumer<T> consumer) {
        this.listeners[state.ordinal()].put(packetClass, consumer);
    }
@FunctionalInterface
public interface PacketConsumer<T extends ClientPacket> {
  void consume(T packet, PlayerConnection connection);
}

    private readonly ConcurrentDictionary<Type, Action<IClientPacket, Connection>>[] _listeners = [];
    public void SetListener<T>(ConnectionState state, Type type, Action<T, Connection> listener) where T : IClientPacket
    {
        var dict = _listeners[(int)state];
        dict[type] = listener; // cannot set this because its not IClientPacket, but rather T
    }