Unwanted offset on curves when importing animation assets

Hello,

We seem to have encountered some unwanted behaviour when importing certain curves from our animation fbx assets into Unreal. Some of these curves don't have keys from the very first frame, but the UE import seems to ignore those non-keyed frames and starts plotting the curve from the first key it finds, creating an unwanted offset:

This is the curve in the fbx asset (animation starts from the green slider):

[Link Removed]

This is the curve after importing the animation in UE:

[Link Removed]

We were wondering if this is a known issue or if we are missing anything in the import options to prevent this?

Thank you and kind regards.

Steps to Reproduce

Required asset: Animation fbx with a curve on the root bone.

1. Add the first key to the curve on frame 100.

2. Export animation fbx on the range 0-200.

3. Import animation fbx into UE: notice how the first key of the curve is plotted on frame 0, essentially shifting the whole curve 100 frames to the left.