data1\Assets\tpp\script\lib\TppStory.lua

Line 595 : function e.CanArrivalQuietInMB(n)

Immediately after, add:

gvars.str_didLostQuiet=false
TppBuddy2BlockController.SetObtainedBuddyType(BuddyType.QUIET)
TppBuddyService.UnsetDeadBuddyType(BuddyType.QUIET)
TppBuddyService.UnsetBuddyCommonFlag(BuddyCommonFlag.BUDDY_QUIET_LOST)
TppBuddyService.UnsetBuddyCommonFlag(BuddyCommonFlag.BUDDY_QUIET_HOSPITALIZE)
TppBuddyService.SetSortieBuddyType(BuddyType.QUIET)
TppBuddyService.SetFriendlyPoint(BuddyFriendlyType.QUIET,100)
TppMotherBaseManagement.RefreshQuietStatus()