HRV, Training readiness, and other metrics way off since 20.26 update

My daughter has the 955 solar. After the 20.26 update on the watch, her HRV and training readiness have dropped significantly. She went from balanced in HRV to very low overnight. There was no "unbalanced" day or two in between like would normally happen during a high recovery period. Additionally, her training readiness has remained at 1 for about a week. Her training status went from maintaining/productive where it had been for weeks to strained and has just stayed there. It has ridiculous recommendations for recovery after every single workout now. She also wears a Whoop at night and a heart rate monitor during her workouts. I know the Garmin is not accurately tracking those, but it's always been a bit off. But since the update, the watch has become useless for anything other than GPS distance for a workout and the heart rate (with the HR monitor). It's taken a really expensive watch and made it unreliable for any other metrics. We had been watching the pattern of improvement over the whole summer, and now it's just gone. Is there any way to go back? I also have the 955 solar, and I have delayed the update on mine because of what happened with hers.