Walls being replaced by air or sculk veins in ancient cities

In ancient cities, a wall may be replaced by air or sculk veins. However, the walls are not updated.

Steps to reproduce the issue:

1. Go to seed 0 (Example).

2. Go to coordinates 21683 -44 1240.

3. Observe the condition of the wall.

Expected result:

The wall does not have the "tall" option activated.

Actual result:

The walls appear with the "tall" option activated, which makes it look like a vertical slab.