Dismounting while the mount model was still pending despawned that child, but the same attach pass could still visit it afterwards. Its plain inserts then landed on a despawned entity, and Bevy's default command handler panicked.
The attach pass now records the children it drops and skips them for the rest of the pass, so the outcome no longer depends on visit order. The despawns there became `try_despawn`.
The player build also installs a command error handler. A failed command now logs a warning naming the command and the entity, instead of ending the session. Every other error still panics, and the tests keep the panicking default, so our own bugs still fail there.
Tests: a dropped pending child is skipped whatever the visit order, for both the dismount and the stale display; the handler logs a failed command and still panics on other errors.
Fixes#2377🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Sam Sung
ce5503ca53