Hi CuriousPeter,
Sorry for the stress; it's not fun. Yes, time is what I try to avoid to take from you.
Since you asked, I checked all internal sources (it's Sunday here, so I was a little bit silent), and after that, I was without any report. I even googled it.
FPS in both places, matching the Alembic. Is the motion vector AOV rendering fine for that frame, to see if the Alembic has the correct data to begin with.
Screenshot 2024-06-16 at 10.37.55 PM.jpg
Another wild guess, hopefully not a time waster, is if you change the Timing on the Alembic (Time Remapping) just a tiny amount. Does this help?
Screenshot 2024-06-16 at 10.44.51 PM.jpg
Redshift Render View> Edit> Clear View Buffer (just in case)
Fingers crossed, you get it done.
My best wishes