PoE Find Caches bugged

[(XBOX)Tucker D Dawg]

So doing a bounty, last stage starts - Find Grineer Caches.

The map waypoints me over to "The Ribs" area of the map and as soon as I got there I knew I was screwed.

Having done these so many times, I knew the yellow circle area was the size for the cave under "The Ribs" but when I had arrived it started the timer.  The problem is not the timer for finding the caches but the abandoning objective timer - since the entrance to the cave is closer to "Seaside Ruins" I had to leave the area to enter the cave and as I was solo there is not enough time (unless nova) to get over to the entrance then down back into the yellow area.

Bounty failed.