Left 4 Dead 2

Left 4 Dead 2

Chernobyl: Chapter One
Sordicus 8 Aug, 2024 @ 5:15pm
The last big door won't open? I played for like 20 mins
We played this map with a friend (AMAZING by the way), and we keep getting stuck on the last map. We fight the horde, kill 2 tanks, then 2 more spawn immediately after, then horde again, then tanks again, and so on.
I timed it and we played the last map for 20 minutes but the door still won't open?? We end up dying eventually.
Is this a bug? or am I doing something wrong?