Metahuman cannot be reimported to UE5 after saving it in Motion Builder

I’m trying to retarget a lot of motions from some datasets (that are available in Blender, which I exported as a bvh file) to Metahuman, so I’m trying to do that by exporting Metahuman from UE, retargeting in Motion Builder with scripting, reimporting it in UE.

Problem is that currently, when I export Metahuman from UE5, and then load & save the fbx file in Motion Builder, UE5 shows up an error when it loads the saved fbx file, even when I didn’t modify anything but simply saved the fbx file in Motion Builder.

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What should I do to import fbx file exported from Motion Builder properly?