I've reported this issue which is FB8587463. Currently it's so unique. This issue has been resolved on specific device but not on other specific device. iPhone Xs : Resolved. iPhone 7 : The issue is still occurring. Both of them are using 14 beta 7. Please take a look at that issue. Thanks in advance. Regards, Seunghwan.

I've updated my iPhone to iOS 14 beta 7, but this issue still keeps happening.