Thanks to the anonymous user who submitted a bug report earlier today! I was able to track down a number of issues thanks to this. Hotfix follows:
HOTFIXES:
-Fixed an issue where players would briefly see an empty briefing room when loading missions without a briefing.
-Quick players could throw the lever in this moment, sequence-breaking the loading process and breaking the game completely.
-If your hangar UI glitched out badly, this may have been why.
-Tweaked ocean lighting and skybox visuals on Zaliznyy.
-Fixed error spam and glitchiness in weapons training mission, to do with drones not having a proper line-of-sight target transform.
-Fixed some other minor errors in mission flow.