The site ground collider was sized to the scene footprint with a 30 m
minimum — exactly the default site polygon, so one step past the site
boundary left nothing under the character controller and the player
fell into the void. The ground collider now extends 2 km (still a
single BVH box) so the ground plane acts unbounded, and a respawn net
in the first-person frame loop recovers the controller if it ever ends
up below every collider (e.g. scenes with no site node), preferring the
live spawn node over the mount-time start position.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
