#fixedupdate

A chase camera that reads a raw fixed-tick position field per render frame makes the player model sawtooth side-to-side. Read WorldPosition (context-sensitive interpolated getter) instead.

Input.Pressed (edge-trigger) is frame-scoped -- reading it in OnFixedUpdate drops presses on frames with no tick, or fires them twice on frames with multiple ticks. Level reads (Input.Down) are fine in OnFixedUpdate. A systematic 100% input failure usually points elsewhere -- instrument each hop.