Fix nested conditional workflow steps

                assert len(progress.when_values) == 1, "Got more than 1 when value, this shouldn't be possible"

            iteration_elements_iter = [(None, progress.when_values[0] if progress.when_values else None)]

        when_values = []

        if step.when_expression:

        when_values: List[Union[bool, None]] = []

        for iteration_elements, when_value in iteration_elements_iter:

                if when_value is False:

            if when_value is False or not step.when_expression:

                # We're skipping this step (when==False) or we keep

                # the current when_value if there is no explicit when_expression on this step.

                when_values.append(when_value)

                    continue

            else:

                # Got a conditional step and we could potentially run it,

                # so we have to build the step state and evaluate the expression

                extra_step_state = {}

                for step_input in step.inputs:

                    step_input_name = step_input.name