snapFlagServerBit toggle alone doesn't clear client entity
interpolation state. Also reset deltaMessage=-1 for all active
clients, forcing the next snapshot to be full (non-delta). The
client receives deltaNum<=0, clears old entity state, and
renders all entities at their new positions without interpolation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>