UE5 import abc GeometryCache material number error

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improt abc by Static Mesh material number is right(number=2),when i import abc by GeometryCache, material number is mistake(number=1)

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Snipaste_2024-09-24_14-55-2520240924151452_jvn9UD
Snipaste_2024-09-24_14-55-2520240924151452_jvn9UD1920×1133 123 KB

this is the shot.

And I found the a solution to the problem，when import abc with GemetryCache , unselect the toggle “Flatten Tracks” on options panel。