So far, there doesn’t seem to be a definitive fix, but one workaround is to disable DirectX12 in the Graphics menu. More specifically, it crashes the game at various points. Hopefully IO Interactive will one day update Hitman 3 with a workaround though it seems unlikely for now. A few people have reported problems with using binoculars in Sniper Elite 4. You’ll still be able to play any story mission and location from the trilogy (as long as you’ve already redeemed them in Hitman 3). Thankfully, going offline doesn’t restrict your access to content from both Hitman and Hitman 2. Although IO Interactive have yet to add any Elusive Targets to the game, these will also disappear if you encounter a connection failure. Sniper Assassin missions are unplayable, as are player-made Contracts. When the Hitman 3 servers are offline, you also lose access to three of its biggest game modes.
This effectively stops you from gaining Mastery XP and means you won’t be able to unlock new loadout options such as weapons, tools, hidden stashes, agency pickups, and starting locations. Perhaps more crucially, playing offline will prevent you from completing challenges.