Normals and Tangents cannot be load correctly when re-importing Skeletal Mesh

This problem started in 4.24 and not in 4.23.
CL 9114926 seems to be relevant.

Import the FBX file into the project, and set the Normal Import Method of Import Setting to Import Normals and Tangetns.
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It is correct when imported, but not when re-imported.

sample : [Link Removed]
1. import
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2. re-import
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The number of vertices changes with each re-import
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