Workflows; Actioning a 'Wait' type Workflow item using Working Days may give incorrect result when actioned automatically

Actioning a 'Wait' type Workflow item using Working Days may give incorrect result when actioned automatically than if it is actioned by the User. E.g., if the Wait period is set to '6d' (6 days) and the Working Days box is checked and a calendar selected, a different 'Recall Date' will be set depending on whether the item is actioned automatically or by the User.