How to stop Roblox from replacing bone with Motor6d upon import?

I’m trying to import an AK rifle, the problem is Roblox keeps deleting the “Magazine bone” and replacing it with a Motor6D most likely due to it being a seperate mesh with a disconnected bone, does anyone know how to stop it from replacing it with a Motor6D?

FBX animation data will not import for that specific bone if it is replaced with a Motor6D, hence why I need it to stay a bone.