Stronghold rooms aren't connected

Some doorways are replaced by walls. This should be fixed because it could result in a player not being able to find the portal and thinking it didn't generate, even though it did.

HOW TO REPRODUCE

1. Load a new world at Seed 1203366317377358591

2. Go to the stronghold at 1368 ~ -872

3. Enter spectator mode and find the portal room.

4. You'll see that there's no door.