Description

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

Steps to Reproduce

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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Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-87842 in the post.

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Cannot Reproduce
CreatedJan 31, 2020
ResolvedMar 13, 2020
UpdatedJun 23, 2020
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