Can't get past Allied mission 9 (Leningrad - The Moon Shall Never Have Them)

TL;DR

Every time I win the mission, the next mission turns out to be the same as before (mission 9). I can't get to the next mission (mission 10). Why is that, and how do I start the next mission?

I'm trying to finish the Allied campaign of Red Alert 3, but I'm stuck on mission 9 (Leningrad - The Moon Shall Never Have Them).

After I destroy the launch facility, I get to see the victory screen as well as the mission timeline. When I click on continue, I expect to see the video cutscene introducing the next mission.

The problem is, I'm seeing the exact same video cutscene as for mission 9. When the cutscene is finished, the briefing for the next mission is the same as for mission 9, and when I choose to start the mission, it's the same as mission 9.

So I decided to load a previous save. Unfortunately, I only had Autosaves, and the latest one was from when I started building my base, so I had to essentially replay the mission from scratch. After winning for the second time, I still got the same cutscene and briefing as before.

I'm effectively stuck in a loop where I keep doing mission 9 and can't progress to the next mission. I can't find anything on the internet, so I have no clue how to fix this. Any ideas?

Just in case this bug is triggered by my playstyle, here's how I finish the mission:

Playing on Easy
Building defenses to keep Soviets out of my base, leaving the Mirage Tanks behind the defensive structures.
Building Proton Cannon to shoot the Iron Curtains when ready.
Building 4 Airports and filling each one with 4 Vindicators to continuously bomb the Iron Curtains.
Occasionally dropping Time/Deluxe/Supreme Bombs and Surgical Airstrikes.
Repeat until mission is won.

What could be the reason I keep playing the same mission over and over again, and how can I get past this loop?

Solution 1:

Why are you so sure there is a Mission 10?

Near as I can tell, all 3 of the factions have a 9 mission campaign. There's nothing wrong -- just bad UX that makes it non-obvious that the campaign is over.

The full campaign mission list is as follows:

Soviet Missions

Leningrad
Krasna-45
Vladivostok
Geneva
Mykonos
Von Esling Airbase
Mt. Fuji
Easter Island
New York City

Allied Missions

Brighton Beach
Cannes
Heidelberg
Gibraltar
North Sea
Mt. Rushmore
Tokyo Harbor
Havana
Leningrad

Empire of the Rising Sun Missions

Vorkuta
Stalingrad
Odessa
Pearl Harbor
Pacific Ocean
Santa Monica
Yokohama
Moscow
Amsterdam

Solution 2:

Checking online, it appears that the Leningrad mission is the last mission of the Allied campaign. There is no mission 10. So there might be a bug in that it doesn't return you to the campaign selection screen, but it's not a bug in that it doesn't start mission 10, because that mission does not exist.