Hi GTA community so I'm training 100% casual run at x360, so I'm using the cab to go to the majority of missions. I call the taxi, he comes, I go to the mission with him and I call him back before enter the mission. But when I skipped the cutsene and go to enter in the back, he isn't even there, just the driver stopped at the middle of the street. Is it really a bug or Im doing something wrong?

Which mission? Sounds like the assassination missions but different missions despawn cabs or have your cab driver simply drive away. The assassination missions (except the first one) require you to wait until he drives off a little bit, whistle, then start the mission.

Unfortunately no it happens in all missions