How do you run Grand Heists with multiple wings?

I unlocked 2 wings in a Grand Heist , entered and did one of them (last room was bugged , vault did not open) , so I opened coffers , triggered the lockdown and got out through one exit.
After that I did not see another portal or a way to enter the second wing.

Did I do something wrong? How do you enter the second wing?

What worked for me is to leave with the exit where you came in ( basicly like in a normal heist ) and not with the shortcuts that you can unlock.

Then you can enter another portal for another heist from there

Thanks for the anser. I'll try that next time , lets hope they fix the grand heist bugs soon