When I load onto a new campaign, after a few seconds (usually less than 30s) the game crashes and my screen gets a weird visual bug with white boxes everywhere (see attached image). I can delay the amount of time it take for the game to crash by reducing my graphics settings but it will always crash eventually. If I rush into the first battle I can play through it with no issues, so it has to do with the campaign map. I was having VERY similar issues with Total War Warhammer 1 and 2 with an almost identical visual bug preceding the crash, though in those two, the game would eventually come back to working after a while.
This makes campaign completely unplayable, I haven't been able to find any similar threads...
Solutions already attempted:
-Game cache verification
-Graphics drivers update
-Turning off almost every possible graphics option in game
-Running as administrator
Please please please help me I've been looking forward to playing this game for so long, I am a huge fan of the franchise
Happy to provide any further information if needed.