I think the new update disables some map interaction and makes the mission not completable now.

ok thanks man, i was probably i bit harsh with the stealth, but i was like very angry because even if i tried again and again it still didnt work out even if i tried everything

Map updated, backroom security weakened for somewhat easier stealth

Alright so i just played through the map and i see what you mean, the backroom guards are a bit too tanky, im gonna try to reupload the map, but if that doesnt work some tips for both.
- Guy on top sec room should be doable enough at close range, just block him from running.
- Try bringing your second undercover for the lower guard

i didn't have the same experience but i can offer how i did stealth. first i used one guy to make sure the guards were on the other end of the lobby before picklocking the north door (The dude on the other end of the hallway doesn't turn around unless he hears you) and i used a walther PPK for the silenced weapon.

whats the point of including stealth, if its near impossible? the metal thing on the south security room make too much noise to torch it and will alert the security team, picklocking the north one is impossible without being spotted, and the guard inside of it will be able to tank all the shots from your silenced weapon and get the QRF on the map. after many try's i just decied to finish it loud without ever trying to finish it stealthly