Guided Transporter State Changed
@Serializable
@SerialName(value = "GuidedTransporterStateChanged" )
A transporter changed what it is doing: travelling empty, carrying, returning, blocked, or idle. state is the transporter state's own name.
This is what lets a viewer tell the two kinds of stillness apart. A transporter parked with nothing to do and one stopped because the path ahead is taken look identical on a canvas, and they mean opposite things about the design.