LBFGS iteration index is always 0?

[TorkelE]

let
    using Optimization

    rosenbrock(x, p) = (p[1] - x[1])^2 + p[2] * (x[2] - x[1]^2)^2
    x0 = zeros(2)
    p = [1.0, 100.0]

    optf = OptimizationFunction(rosenbrock, AutoForwardDiff())
    prob = Optimization.OptimizationProblem(optf, x0, p)
    callback = (opt_state, loss_val) -> (println(opt_state.iter); false;)
    sol = solve(prob, Optimization.LBFGS(); callback, maxiters = 10)
end

prints

0
0
0
0
0
0
0
0
0
0
0
0
0
0

Changing to e.g. Adam gives

1
2
3
4
5
6
7
8
9
10
10