Mesh join and mesh weld doesn't merge the duplicated vertices

These two mesh has one common boundary line and 10 common veretices, which includes 133-128=5 vertices in each mesh on the boundary line.

After mesh join and mesh weld, these vertices are not merged.
Why?
1.gh (21.2 KB)

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Kangaroo2’s Combine & Clean component does joining, duplicate vertices removal (and welding ?) all at once.

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