is Manual Referencing Count in Objective C vulnerable to buffer overflow attacks ? or is non ARC applications vulnerable to bufferOverflow attacks?

Reg : CVE-2021-42574 :: How to check my Objective C & Swift code is having any BiDi character ? Like Java can we change our compilation encoding in Xcode & identify the issue areas ?

Any update from Apple on CVE-2021-42574 fix ?

What is Xcode's default compilation Encoding ? How to change it?

I am getting a grey line in UITableViewCell. I debugged with all possible ways, but I couldn’t figure out the root cause. In addition, this issue occurs only in iPhone 12 devices. The Red coloured highlighted lines shown not be there as checked in iPhone 11 max pro, iPhone 8+, iPhone 6 Plus,Iphone X

The line separator is missing in the alert controller. I am encountering this issue only in the iPhone 12 series devices, in the other versions it works fine. The line separator should appear as its appearing in iPhone 11 max pro, iPhone 8 Plus, iPhone 7 Plus, iPhone 6 Plus