[BUG] Tank can keep LOS through fence covers

[Derpduck]

Describe the bug
Tank does not lose frustration when survivors are behind the green fence cover props:
fence_cover001_64
fence_cover001_128
fence_cover001_256

To Reproduce
Steps to reproduce the behavior:

1. Go to any map with the green fence covers, e.g. the start of c5m3
2. Place a survivor on one side of the fence
3. Go to the other side of the fence as a tank
4. Frustration meter remains full

Screenshots/Video
If applicable, add screenshots and/or video to help explain your problem.

Server Operating System (if applicable):

• Linux/Windows

Additional context
Decompiled model .qc file, I don't see anything obviously wrong that would cause this though?

$staticprop

$bodygroup "body"
{
	studio "fence_cover001_64.smd"
}


$surfaceprop "wood"

$contents "solid"

$illumposition 0 0.871 68

$cdmaterials "models\props_urban"
$cdmaterials ""

$cbox 0 0 0 0 0 0

$bbox -4.6 -34.1 -2.1 1.382 34.1 138.1

$definebone "static_prop" "" 0 0 0 0 0 0 0 0 0 0 0 0


$sequence "ref" {
	"fence_cover001_64_anims\ref.smd"
	fadein 0.2
	fadeout 0.2
	fps 30
}

$collisionmodel "fence_cover001_64_physics.smd"
{
	$mass 99.84309
	$inertia 1
	$damping 0
	$rotdamping 0
	$rootbone " "
	$concave
	$maxconvexpieces 1

}