I'm not the only one reporting this, and this is highly annoying to new players who cannot see the last cutscene of the first campaign episode (If they choose to skip the mission).
I've tried everything, trying to go under the speedboat, everything you can possible imagine. But, still no option to get into the boat.
Also something that might be linked with it, is that the player waypoint says disembark at the boat.
You don't want to disapoint your new Arma players. It's not a nice way to end the epic ending of the first campaign. For Arma rookies, thanks!