convert(::Type{TensorMap}, H::FiniteMPOHamiltonian) fails

[benjamints]

Using the Heisenberg Hamiltonian from the test/setup.jl the function convert(::Type{TensorMap}, H::FiniteMPOHamiltonian) fails with AssertionError: iscyclicpermutation(p), see example below:

using MPSKit, TensorKit

function heisenberg_XXX(::Type{SU2Irrep}; spin=1, L=Inf)
    h = ones(ComplexF64, SU2Space(spin => 1)^2 ← SU2Space(spin => 1)^2)
    for (c, b) in blocks(h)
        S = (dim(c) - 1) / 2
        b .= S * (S + 1) / 2 - spin * (spin + 1)
    end
    scale!(h, 4)

    if L == Inf
        lattice = PeriodicArray([space(h, 1)])
        return InfiniteMPOHamiltonian(lattice, (i, i + 1) => h for i in 1:1)
    else
        lattice = fill(space(h, 1), L)
        return FiniteMPOHamiltonian(lattice, (i, i + 1) => h for i in 1:(L - 1))
    end
end

H = heisenberg_XXX(SU2Irrep; L=4)
h = convert(TensorMap, H)

[lkdvos]

Thanks for reporting as well as providing the breaking example, that helps out a lot for getting things fixed quickly!