Live retail cdb tracing + acdream probes root-caused the creature chase "slide"
end-to-end, SUPERSEDING the earlier MovementManager-coexistence hypothesis
(eb423fb7):
Chase run cycle is manufactured client-side from mt-6 MoveToObject:
HandleUpdateTarget -> MoveToObject_Internal -> (TurnToHeading node completes
via UseTime) -> BeginMoveForward -> _DoMotion(RunForward) sets substate.
BeginTurnToHeading (MoveToManager 0x00529b90) bails while
CMotionInterp.motions_pending is non-empty (retail-faithful).
acdream's pending_motions EXPLODED to ~1.3M entries (live: add=1.37M vs
done=5.7K) because the NPC per-tick called rm.Motion.apply_current_movement
EVERY FRAME, which for a remote (has a DefaultSink) re-ran
ApplyInterpretedMovement and re-dispatched the WHOLE interpreted state (stance
0x8000003C + forward=attack + sidestep/turn stops), each appending a
pending_motions node that barely drains. => MotionsPending() permanently true
=> the chase turn never started => BeginMoveForward/RunForward ~never fired =>
the creature slid in an idle+attack pose. Retail dispatches per MOTION EVENT
(per UM), never per frame — cdb drain trace: retail add_to_queue == MotionDone.
FIX: delete the per-frame apply_current_movement call in the grounded remote-NPC
dead-reckon path (GameWindow ~9992). The motion is already dispatched per UM by
the funnel (MoveToInterpretedState) + by the MoveToManager per node; body
velocity is refreshed directly by the existing get_state_velocity line.
RESULT (verified live): pending_motions depth 1.3M -> ~1 (add~=done); "stuck in
attack animation" GONE (user-confirmed); run cycle now installs (BeginMoveForward
1->10, RunForward held 0->7). PARTIAL: still not fully sustained — BeginTurnToHeading
still blocked motionsPending=True 256/272 (94%) because a residual Ready
(0x41000003) stop-node backlog keeps the queue from fully emptying between swings
(retail hits add==done exactly). acdream gets ~10 run-starts vs retail's ~21, so
it now twitches+glides instead of a clean run-then-stop. Residual = the R2/R3
Ready-stop drain (next session; see docs/research/2026-07-04-*-handoff.md).
Also includes the env-gated #170 diagnostic probes used to find this
(ACDREAM_MVTO_DIAG=1: [mvto]/[npc-tick]/[drain]/[drainq]) — TEMPORARY, strip when
#170 closes. No effect on normal runs. Core suite green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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