Still have this problem (UE 5.0.3) - feeling that the engine automatically creates an interpolation loop (Menu Asset->Add Looping Interpolation) even though there is no such setting. I tried changing the rootmotion, interpolation, compression settings, delete animation modifiers - nothing help.
Any other ideas? And who has already switched to 5.1, can you tell if this problem remains there or is it fixed?
EDIT: Tried this “UE5 bug when trimming animation? - #5 by Vegan_Lightning” - didn’t help either, even after restarting the Unreal 