Since my first report of this issue, I have been doing further testing. It seems that since the encounters in the nether were changed from always spawning into hull breach to a random spawn location, you must complete the hull breach to trigger the tracking of each encounter. This means, if you get the hull breach as the first location, you're good to go. If you get the hull breach as the second location, the first encounter will not be tracked etc. if you never get the hull breach, none of the encounters will be tracked, The triumph, based on data from braytech, is to complete 150 encounters, so, as a % a single encounter may not sure any progress, but you can see the count go up on braytech. Based on my findings, it seems that the best option, and you are trying to complete this triumph, is... If you do not spawn into the hull breach, on first entry, to leave and try again, until you do get the hull breach to appear. I have not completed huge numbers of tests (takes far too long), however this has worked for me so far. If anyone has observed the same thing please comment, Bungie, please investigate and resolve this,