Bug, fog of war not being explored, you can see my second here is actually under the fog of war, my cursor is above them https://imgur.com/a/yaBeNJP
sorry for slow reply. It always occurs when I reload a game. Exiting to the main menu and loading from there fixes it. I wonder if it has something to do with specific gpus, depending on how long it's been an issue for you. I was playing with an intel hd620 igpu. With older builds of your game i never had this issue, but i was using an nvidia dgpu.