Why aren't OFP's AI soldiers boarding boats?

This was a bug introduced in OFP version 1.40 and corrected in OFP version 1.42.

It affected both NATO's PBR and Russia's boats. Many players reported it. This made completing missions such as the 1985 Cold War Crisis campaign's Recon mission very difficult, as you may have had no choice but to kill your teammates in order to complete the mission.