I agreed to your netcode-topic (I programmed some multiplayer games and it is a common term since cs times) and it doesn’t count. So you are the only one with these issues 
Yesterday I got teleported out of a house. You throw nades and they dissapear when you get killed shortly after. So there are two topics: bad server, bad code
And yes - my connection is bad. All the other shooters I play are running very bad. Not.
Not time related, is always there.