At the docks in Komarovo (Town west of Balota and east of Kamenka), there is a dock near the industrial section that has an incorrectly functioning hitbox? Whenever you swing a melee-weapon while on the docks, it collides with an invisible object, stopping your swing as it began. This makes combating zombies and players impossible while on a dock. So far I have only tested this at Komarovo and only with a Crowbar, but I assume the theory holds true for the rest of the melee weapons and perhaps even firearms. Will test further.