The wizard is deliberately designed not to work with the browser back and forward. This is because getting between sub-steps or steps may require validation. Hence it also isn’t possible to navigate via URL directly to a step or sub-step only to the wizard front screen.
I would therefore expect hitting browser back to take you to either the 1st page of the wizard OR the screen you were on before the wizard.
I can’t actually replicate the behaviour you describe but as browser back/forward navigation isn’t supported in the wizard then this isn’t something we are going to spend time investigating.