Step to reproduce issus
1.open any project with cc3 base and send the file via unreal live link 1.2.
2. play xsens mocap data and send to iclone 7.
3. iclone 7 motion live enter "preivew "mode and using xsens data
4. unreal engine recieve live link animation data. (iclone live link 1.2, ue4.24)
5. use animation blueprint to record animiaton sequence( named sequence 1).
6. Inside sequence 1, you will found out some of the frame has no data and remain the same pose as the last frame.

but

For step 3, use "RECORD" mode in motion live and play back the animation data in iclone 7. the animation sequence has NO miss mocap data for EACH frame.