Use dead blending for the transition.
Only the destination state is evaluated during the transition. The source state's velocity at the moment of transition is captured and each channel is extrapolated using an implicit exponential decay with per-axis heuristic half-life, then cross-faded to the target pose. This produces smooth, physically plausible transitions without requiring a dedicated source clip to blend from. Requires an AnimationDeadBlendingPlayable in the graph.