I have a Mixamo rigged character and converted it using the Mixamo Converter to add a root bone, also converted the Mixamo animation to add a root bone as well. The procedure worked in UE5.3, but it failed in UE5.5. The character does not move at all during playing animation with root motion enabled. I have attached the skeletal mesh and jump attack animation for testing below:
Great Sword Jump Attack.fbx (280.4 KB)
SK_Warrior.fbx (674.7 KB)