Debugging patterns

Isolation ladder

1. Confirm the Skeletal Mesh uses the expected AnimBP and Skeleton.
2. Play the Montage in its editor and preview the intended Section path/Slot.
3. Confirm the matching Slot node lies on the evaluated AnimGraph path.
4. Play without layering; then restore Layered Blend per Bone/masks.
5. Log play return, active montage/instance, current Section, position, weight, and callbacks.
6. Disable root motion and notifies separately to isolate pose versus gameplay/movement faults.
7. Test standalone, listen server, owning client, simulated client, and dedicated server.

Symptom	First check
Montage reports playing but invisible	missing/bypassed Slot node, wrong Slot/Group
Upper body affects legs	layer branch bone/mask and mesh skeleton
Stops unexpectedly	competing montage in same Slot Group, ability cancel
Combo never advances	Section names, current Section, next-section relink timing
Loop never exits	wrong From Section, relink after boundary, stale input
Notify callback absent	playback node type, Montage Notify type, Slot/link/filter settings
End event missing	interruption/cancel path not handled
Mesh snaps to capsule	root motion disabled/mode mismatch/root lock
Server/client differ	playback trigger and gameplay state not replicated/predicted coherently
Works at normal rate only	notify window/section boundary tied to frames rather than semantics

Acceptance suite: early/late cancel, overlapping action request, same-group interruption, death/stun, owner destruction, extreme play rate, low FPS, root-motion obstacle, network latency/loss, and every terminal callback.