Home Advantage perk

Maybe this will help: I played another game and got to see the glitch in action.

Code:

[00:01:15] Xena Bay, Nick Howard, Brooke Lovecraft, Ben Woods, Jacob Murphy and Vanessa Lewis watch as 9 zombies approach the Mansion. The survivors are able to pick off 6 zombie(s) before they reach the building.
[00:02:08] Xena Bay fires at a zombie with their shotgun. The zombie stumbles.
A zombie collapses to the ground. 8 zombie(s) left.
Nick Howard fires at a zombie with their shotgun. The zombie stumbles.
A zombie collapses to the ground. 7 zombie(s) left.
Brooke Lovecraft fires at a zombie with their rifle. The zombie stumbles.
A zombie collapses to the ground. 6 zombie(s) left.
Ben Woods fires at a zombie with their rifle. The zombie stumbles.
Jacob Murphy fires at a zombie with their rifle. The zombie stumbles.
A zombie collapses to the ground. 5 zombie(s) left.
Vanessa Lewis fires at a zombie with their rifle. The zombie stumbles.
A zombie collapses to the ground. 4 zombie(s) left.

[00:03:40] The zombies smash their fists against the building's fortifications. The barricades are holding.
[00:04:00] Xena Bay fires at a zombie with their shotgun. The zombie stumbles.
A zombie collapses to the ground. 3 zombie(s) left.
Nick Howard fires at a zombie with their shotgun. The zombie stumbles.
A zombie collapses to the ground. 2 zombie(s) left.
Brooke Lovecraft fires at a zombie with their rifle. The zombie stumbles.
A zombie collapses to the ground. 1 zombie(s) left.
Ben Woods fires at a zombie with their rifle. The zombie stumbles.
Jacob Murphy fires at a zombie with their rifle. The zombie stumbles.
A zombie collapses to the ground.
That seems to be the last one.
[00:05:02] The building was defended without casualties.