The tracker emitted the kitty push/pop stack form (ESC]22;>shape and ESC]22;<). Ghostty's OSC 22 parser treats the whole payload after "22;" as a literal shape name, so ">shape" is not a valid shape and is dropped — the pointer never changed on Ghostty (and any other set-only terminal). Switch to the portable bare set form: set the shape on enter (ESC]22;shape) and restore the base by setting "default" on leave. kitty and Ghostty both honor this. The trade-off is that we assume the base shape is "default" rather than restoring a non-default prior shape; the push/pop helpers remain exported for callers that target kitty and want exact save/restore.