Hopefully more voices will assist in getting Apple's ear. Can confirm this is still happening for passes we're creating. Multi day events expire 24 hours after the relevantDate. Would expect it to use the end date we're passing along in the expirationDate but instead it's using the relevantDate. Using a version 17.6.1 iPhone to confirm the issue. Only way to get around it is to use the end date as the relevantDate and that is not optimal since we're losing the notifications we would normally get when the multi day event is about to start.