Problem with the 'return_all' parameter in the 'vqe_run'

[altaranus]

Hello.

While running the
'result = vqe_inst.vqe_run(.....)' function, in accordance with the documentation I set the parameter 'return_all = True' in order to get the intermediate values (of expectations and ansatz parameters) in all iterations. However, when I ask for the result['expectation_vals'] , I get the empty array.
The same for the 'iteration_params'

What is the problem? Is it a bug?
Thanks