I think I might have figured out how to replicate the never ending harvest bug. Seems like it may be related to when you're automatically dismounted when you click the node while you're a ways off the ground. Here are the steps:
1) Hover over the node about 4-6 meters and click to harvest it.
2) You'll dismount and parachute down and it'll cancel the harvest
3) Click again to harvest and it'll already have been continuing without you.
4) Should keep going at 0%