For Nether fortresses, the building element with the id:NeMT, i.e. the one with the spawner.
The bounding box is one block too low, which is why the top 3 fences are not in the bounding box.
In the screenshots you can see the coordinates of the bounding box and then what the structure in question looks like.
Example:
Seed:-3960378471346730310
Coords: -142 80 86
Steps to Reproduce:
Create a world and enter the Nether
Use an NBT editor and search for the structure data of a Nether fortress
Find a structure part with the id:NeMT, i.e. the one with the spawner.
The int array BB now provides the corner coordinates of the bounding box
Observed Behavior:
The bounding box is 1 block too small
Expected Behavior:
The three upper fences of the structure are inside the bounding box
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Comments 2
Thank you for updating the issue. Though, it is still unclear to me how to find the bounding box of the fortress. An exact step-by-step showcase would be appreciated, as "Use an NBT editor and search for the structure data of a Nether fortress" is very vague considering there's a lot of data to look through.
I am unsure how to confirm this issue. How have you checked to see the area of the bounding box of the structure?
Adding steps to reproduce this issue would be very helpful.