In 1.12.1 every unit has mover state from its create (`0x619456` → `0x617b00`). A unit created moving is dead-reckoned from the create, and a move the tick fires mid-frame steps on from its fire time (`0x618d67`). benilla left such a unit standing until its first movement packet, and stepped a queued move over the whole frame.
Now every remote unit gets mover state at its create and is dead-reckoned from it and from each fire time. The facing system keys on the mover's bits and the unit's type (`0x600cd0`). A relay during a server path applies at once, and every monster move holds the spline that forces the next relay (`0x618c43`). The flush acts only on root and teleport (`0x618080`). A unit created airborne goes on along its arc, its start height rebuilt from the fall time.
Tests: one per behaviour, each failing on its parent.
Fixes#2853Fixes#2852🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Sam Sung
e93c2e2129