Open Pratepresidenten opened 6 years ago
Found out the cause of this. When an elevator passes through a fully infested zlevel of vines, the covered openspace vines merges into the elevator wall, making them untargetable unless you take the elevator wall apart.
There are rare occations where a biohazard vine is not visible, but remains inside a wall segment and keeps growing until you tear the wall itself down to kill the plants.