Bonjour Madame !
A sentence stated in the lesson reads -
“Elles se seront réveillées trop tard et auront manqué leur train.”
Could this sentence have a better meaning if one writes as -
“Elles se seront réveillées trop tard et manqueront leur train.”
This would indicate that the action of waking up will get completed first, followed by that of missing the train.
As the grammar tip in one of the lessons at Kwiziq states-
Le Futur Antérieur-> Action which will finish first.
Le Futur Simple -> Action which will happen once the former action gets completed in the future.