Howdy.
Someone already put a video up of this bug on YouTube here: https://www.youtube....h?v=yg53lqMMQi4
On the Solo Campaign mission Reclaimer right before leaving the Mammoth, the ground disappears. After the Cortana voice over, the Mammoth disappears.
When the ground disappears, if I jump off the Mammoth, I fall for a little bit, the screen freezes, and I go back to the previous checkpoint. The Mammoth does not fall though. When the Mammoth disappears, I do not fall through it. The textures are gone but the physics remain.
Save and quitting then resuming the campaign does not fix this. Restarting the XBOX does not fix this. Starting the game from Rally Point - Bravo causes me to lose my saved progress but at least lets me start from where I would have been had the game not bugged out.
IMHO: This game seems more like a beta than a finished product. If the company releasing this beta game forces us to pay to be beta testers, then it would be nice if said company at least provided said beta testers with a dedicated bug forum.
Thanks and good luck.
Update:
The reason for this bug is hooked in to the unidentified covenant ship in the previous area. If the ship doesn't blow up, then the next are does not load. I think it has to do with the method of getting on the ship. I hypothesize that if I use the jetpack to go to the top of the ship, then the ship does not fly away and blow up. If I use the normal means to board the ship, then it acts normally.