[TF2] Zombie Infection: Sniper's Spit adds a missing texture overlay when walking over it

[KiwifruitDev]

The following screenshot is from zi_woods through Casual, with a custom HUD that allows for transparency:

This is the same demo being played back without a custom HUD:

This overlay is only shown when stepping on the spit.

[chl0rine03]

same exact thing in my game, there's also a massive missing texture on the new manhattan zombie map where windows should be