Some bones dont moving in seaparated meshes rig

Im making a game based on skinned meshes rigs. Some rigs i need to seaparate by materials because in main my rigs is just a 1 mesh with a lot of materials but roblox dont have a function to add more materials on mesh. So for some rigs when i import non seaparated version, his animation looks good, but when i import seaparated by materials version, some bones like hips and head one just dont move in animations, they just lost their keyframes(or just dont rotating or moving)! Also i didnt edited any bones names + that bones are anchored so they just unrotatable or moveable.


On a video ill show what im trying to explain.

no beta features enabled (never used it)
win 10 ltsc, amd ryzen 5 2600 six core processor, 16 gb ram, NVIDIA Geforce GTX1660

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It has nothing to do with materials. you should import animation as selected also check your bone hierarchy maybe you deleted the root bone

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No, i didnt deleted any bones as i said. Also animations was imported as “Selected”

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