Steps to reproduce

1. Make a small structure, such as a 5x5x5 cube, within negative Y coordinates. (Y < 0)
2. Place a structure block at the top SE corner of the structure, set it to corner mode, and put "Hi" for the name.
3. Place a structure block at the bottom SW corner of the structure, set it to save mode, and put "Hi" for the name.
4. Press the "detect" button under the coordinates section of the save structure block.

Expected result

The save structure block detects the corner structure block and updates the size and offset coordinates.

Observed result

The save structure block does not detect the corner structure block. In other words, nothing happens.