I seen this in a modified Lyra Project when I was setting it up and as you said it isn’t affected by time dilation, but after recording it in slowmo I was about to play the video back and step through the video frame by frame until I seen it. Come to find out the issue for me was actually Foot Sync Markers. In Lyra I didn’t realize this but if you look at their pivot animations the first part of the Pivot does not actually have Foot Sync Markers, If you go back and use the Anim Modifier to generate them you will see it places them there automatically…so they must have removed those sync markers to fix their issue. I did this and that issue went away…even the Start and Stop transitions I replaced had the issue, so I went through and removed the Sync Markers from around the time that the issue occurred on the animation, and this fixed this issue for me.
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