Can confirm this is continually happening to me. Just purchased last night. After reproducing it twice, I neglected to save the track file due to frustration, but I do have a tacview export. if that in any way helps: https://drive.google.com/file/d/1qLxy4-ybc8NXWdcTQxjwF0cQSe1HaWIW/view?usp=sharing
Things I've noticed ...
I cross the runway and lineup, but continue rolling to ensure I'm lined up. Before I even press spacebar to let him know I'm lined up and ready, he has started his takeoff roll and just cheeses it straight down the runway, going all the way into the air. Second time, I had pressed spacebar while still rolling a little bit and looking backwards to see what he'd do. Sure enough, he started his takeoff roll, crashed into me, and continued to takeoff like nothing had happened.