The cause is that the ImportFBXProperty in MovieSceneToolHelpers.cpp is divided by DecimalRate.
But, this calculation is also done in FMatineeImportTools :: SetOrAddKey,
so there is no need to divide in ImportFBXProperty.
Probably the cause of this issue is that CL-4443201 does not consider ImportFBXProperty.
expect : The curve of the Cine Camera Actor is completely reproduced
result : The Tangent value of the Cine Camera curve (Current Focal Length in the example) is different.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-122123 in the post.