Stronghold rooms and corridors can be blocked off by other parts of the stronghold

The Bug:

Stronghold rooms and corridors can be blocked off by other parts of the stronghold.

Here is an example:

Seed: 8949347867455562597
Coordinates: /execute in minecraft:overworld run tp @s 11300.08 -18.41 -2781.56 -60.14 28.80

Steps to Reproduce:

1. Generate a world with the seed provided above and teleport to the given coordinates.
2. Look at the generation of stronghold corridors and rooms.
3. Take note as to whether or not stronghold rooms and corridors can be blocked off by other parts of the stronghold.

Observed Behavior:

Stronghold rooms and corridors can be blocked off, causing some rooms/corridors to be inaccessible without manually digging into them.

Expected Behavior:

Stronghold rooms and corridors would never be blocked off, therefore allowing the structure as a whole to be navigated more easily.

Code Analysis:

Code analysis by skyrising (Simon Wanner) can be found in this comment.