This bug is due to the refactoring of the statistics builder service, in 2022 august. The default_options were not defined so the nightly worker has no luck to run. The statistics may not have been built since then, so a rebuild is required
Previsouly, the reservation was expecting parameters like: slots_attributes: [{start_at: date, end_at: date, availability_id: number}] Now, the reservation is expecting simpler parameters like: slots_reservations_attributes:[{slot_id: number}]