Broken jacobian

I have discovered an example in which the Jacobian test breaks. I do not see the reason (yet?) why it should not work.

import numpy as np
import nifty6 as ift

dom = ift.UnstructuredDomain(10)

op = (1.j*(ift.ScalingOperator(dom, 1.).log()).imag).exp()
loc = ift.from_random(op.domain, dtype=np.complex128) + 5
ift.extra.check_jacobian_consistency(op, loc)

Note the + 5 which shall make sure that the branch cut of the logarithm is avoided.