The following are active issues for Halo: The Master Chief Collection as of 10/13/2021 in build 1.2580.0.0.

Issues from Halo Support tickets

The issues in this section are being investigated further because of tickets players submitted to Halo Support.

For the first three issues below: if you encounter them, please submit a ticket with info including a timestamp for when the issue happened, the game mode, and the map. This will help us investigate them further:

Rarely, a player can be disconnected from matchmaking after loading the map but before the gameplay starts. This also results in a short temporary matchmaking ban.
Rarely, players can be “dropped” mid-match and are stuck on a loading screen until the match ends.
Players can be kicked from matchmaking with a “Leaving…” notification as soon as the lobby is full.

Other player-reported issues:

In Halo 2: Anniversary, entering or exiting a cutscene can result in being returned to the main menu.
In Halo 2: Anniversary, while in Anniversary Mode on Xbox One X and Xbox Series X|S, framerate drops can occur.
Players can be disconnected from an online match with a “Connection Interrupted” error.

Please submit a ticket if you encounter this issue.

In Halo 3, players can “freeze” several minutes into a multiplayer game.

Please submit a ticket if you encounter this issue.

In Halo: Combat Evolved Anniversary co-op campaign, both players are sometimes returned to menus with a disconnect error when loading into the campaign if players have significantly different load times.

User Interface (UI)

General

New - When a match host attempts to start the match but player(s) in their party do not have the necessary game content installed, players without the necessary content do not receive a prompt telling them they are missing content.
New - In Matchmaking throughout Halo: The Master Chief Collection, the loading screen occasionally does not display the game variant icon or the game type text description in the lower left.
New - In Matchmaking for Halo 3, Halo: Reach, and Halo 4, the loading screen occasionally switches the title of the map variant in the top left and the tool tips in the lower left.
New - While using mouse & keyboard on PC, exiting the Create menu in the Custom Game Browser and the Report a Player: Other prompt requires pressing the Escape key twice.
New - When watching Terminal videos in the Videos section of Extras, subtitles for some non-English languages have extra symbols.
In the Extras menu, while watching a cinematic, pressing the “A” button exits the video instead of the “B” button. On PC, this is the “Space” key instead of the “Esc” key.
In the Extras menu, the Halo 2: Anniversary cinematics do not have subtitles.
When attempting to enter a multiplayer game in a party with a player who has an extremely poor internet connection, there is a chance the countdown timer will remain at 0 forever, causing a soft lock without an error message. If attempting to create a Custom Game Browser match, the host will encounter a hard lock and must restart the game.
Shifting the computer’s focus away from the Halo: The Master Chief Collection splash screen that appears when launching the game occasionally causes it to become a background process. This requires a force close of the game from the task manager.
Issues activating text chat can be caused by action mapping from the previous input.ini carrying over between updates. Deleting OpenTextChat_Keyboard from the input.ini may fix this issue.
On PC, the game may freeze if the “Quit to Desktop” button is pressed shortly after loading the main menu
When trying to “Save As” File Share game types and/or maps for titles you do not own, they will appear to be corrupted upon restarting Halo: The Master Chief Collection

Settings

Gamepad settings do not revert to defaults when using "Restore to Default Settings" as a guest or secondary profile on Xbox
While in the Settings menu, players encounter a “Save Settings” prompt after selecting Restore to Default Settings even when settings are already set to default
Navigating to settings while disconnected from the Xbox network after loading out of game content causes a “Server Regions Invalid” pop-up to appear. The prompt can be dismissed by selecting Restore Defaults.
If Halo: The Master Chief Collection is launched with HDR enabled, disabling HDR then re-enabling it causes the HDR sliders to stop functioning. Restarting the game fixes the issue.

Custom Game Browser (CGB)

New - While using mouse & keyboard, double-clicking a player in the Roster while a session is highlighted in the Browse menu will join that session.