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

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.