The animation retargeting system in unreal engine 5 has some significant differences compared to unreal engine 4. The retargeting system is based on IK Rig and IK retargeter assets. If you try to retarget some animations with rootmotion that worked properly on unreal engine 4 mannequin rig, into unreal engine 5 manny skeleton with default IK rig and retargeter settings, rootmotion will not transfer properly into unreal 5 skeleton. You have to change the retarget root and translation settings. I am going to show you how to do that in this video.
project files: https://arimac-my.sharepoint.com/:f:/g/personal/thilina_arimaclanka_com1/EudD6Rc_C0JCnGSat5QT3l0B_8VwTuE4JvU9RbmUXwv8xA?e=dlLtbc
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