Kicking The Hornet's Nest Problem

[Starcrossed]

Hey guys,

Just want to know if anyone else is having having issues with this (Kicking The Hornet's Nest) mission. My first playthrough was on EASY and I finished the game. The second playthrough, WARRIOR, I can't get passed the fields. After burning all the fields, the game registers only 3 out of 5 fields burnt, sometimes 4 out of 5 fields burnt. I have tried restarting the checkpoint, restarting the mission, respawning the checkpoint before and after burning the fields, respawing check point after burning fields and making my way to the boat but nothing. This took me a good hour or so.

This video shows the problem.
Far cry 3 "Kick the Hornets nest" Bug - YouTube

Suggested solution - but this didn't work for me.