But luckily it automatically readjust itself to earth automatically every half year exactly for these events. So on 15.10 we will know, if it is really lost. In either case, the end of its mission is near anyway, because the nuclear batteries are near its end.
edit: Nasa has a blog post on this https://blogs.nasa.gov/sunspot/2023/07/28/mission-update-voy...
Lots of formal processes capture what would otherwise be informal design decisions elsewhere. In this case, they probably have reams of pages detailing a failure mode effects analysis (FMEA). One mode is “oops, we sent the wrong command” and the document would define the specific design mitigation(s) for that outcome until it reaches an accepted risk threshold.