I tried just now on Android, and it didn't.
On Android, you can hard press the app icon, select the i button that pops up, hit Storage on the next page, and hit Clear Cache on the bottom. (Not sure about iOS.)
I was planning an April trip, and had been planning on getting up at 3am, and they changed it right before my days came available. I was grateful to not have to get up three hours earlier. (Might have been beginning of February, but it was an abrupt change - they didn't announce it.)
My post about it back then.
I booked Trader Sam's and Lamplight for September at 6am last month, so unless they changed it back in the last month (which seems unlikely given the responses in this thread), I assume it's still 6am.