Structure block will not detect corner block

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1. Using attached world files named "My Building World"

2. . Added corner block at -1 -19 -9 and named it "OakwoodManorV4"

3. Added corner block at -1 -19 77 and named it "OakwoodManorV4"

4. Added corner block at -1 -62 77 and named it "OakwoodManorV4"

5. Added corner block at 67 -19 77 and named it "OakwoodManorV4"

6. Added corner block at 67 -62 77 and named it "OakwoodManorV4"

7. Added corner block at 67 -19 -9 and named it "OakwoodManorV4"

8. Added corner block at 67 -62 -9 and named it "OakwoodManorV4"

9. Added structure block at -1 -62 -9 and named it "OakwoodManorV4"

10. Turned off "Include Entities" on structure block

11. Selected "Detect" on structure block

12. Structure block will not detect corner blocks

I looked at your world. I am surprised to discover that corner blocks allow you to exceed the normal maximum of 64 blocks horizontally (x or z) for structure blocks (if you try manually setting a size too big in the structure block itself, it changes it to 64 on the x or z). It seems that corner blocks too have a maximum, but it's instead at 79 blocks horizontally. I tried placing a corner block at 67 -19 71 and it detected it, placing the z size at 79. Any further away and it wouldn't detect.
Also, you only need the corner block that is in the opposite corner (in all dimensions) from the structure block (you don't need one at every corner). For example, looking at TowerMansionV4, its structure block is at 109 -62 0. You'd only need the one corner block at 145 -29 44 to select the entire structure.

I got the same results as in the previous comment.
I expect this is working as intended because the corner blocks in the world save are farther away than the intended size limit for structures or 64x256x64.