The following are active issues for Halo 3: ODST as of 10/13/2021 in build 1.2580.0.0.

User Interface (UI)

Stats and Medals earned in Halo 3: ODST’s Firefight mode are not uniquely identified in the Options & Career menus.

Gameplay

Shadows cast on characters, enemies, and vehicles may appear very dark during gameplay.
Splitscreen players on 5.1 Surround Sound may encounter issues with audio transitions after an audio log is complete.
Single shot weapons, such as the Automag or Covenent Carbine, recoil more aggressively than in the original game.
Players who are at non-16:9 aspect ratios, extended Field of View (FOV), and/or centered crosshair will occasionally see through the player’s character model.

We have made several improvements based on feedback from our recent Halo 3: ODST flight, but are still nailing down other places this issue occurs.
Please submit a ticket with Halo Support if you encounter this and include media, replication steps, and additional details about when or how this was encountered to provide our developers an in-depth view of the issue.

Player grenades appear to teleport and explode offset from initial landing spot.

Mission progress resets to the beginning of the mission when selecting Resume Campaign after switching between an Xbox One console and an Xbox Series X|S console.
Player loses Audio Log collection progress after death when working on “Record Store Owner” achievement.

Films from the mission “Mombasa Streets” will sometimes show an inaccurate name and preview image in menus and load screens.
On Xbox One, Flying Camera Settings do not apply to Theater controls.