iOS 14 Beta3 ATTrackingManager question

1. iOS 14 have new class for request tracking promission , and we want to be compatible with this method in advance, first of all, i cant submit my app with the new Api by Xcode12Beta3. so i want to use "respondsToSelector" api to confirm users device can use [ATTrackingManager requestTrackingAuthorizationWithCompletionHandler:], but when i use

[NSClassFromString(@"ATTrackingManager") respondsToSelector:NSSelectorFromString(@"requestTrackingAuthorizationWithCompletionHandler:")]

i get false status. only if i call the method once. after that,i can get the true status. this is very strange. i thing this would be a bug.

Code Block language
NSString *class = @"ATTrackingManager";
    NSString *sel = @"requestTrackingAuthorizationWithCompletionHandler:";
if ([NSClassFromString(class) respondsToSelector:NSSelectorFromString(sel)]) {
      void (^statusBlock)() = ^(int status) {
         
      };
      [NSClassFromString(className) performSelector:NSSelectorFromString(selName0) withObject:statusBlock];
    }
/// [NSClassFromString(class) respondsToSelector:NSSelectorFromString(sel)]	 i get false

If I call the following iOS14 new method after the above method

Code Block language
[ATTrackingManager requestTrackingAuthorizationWithCompletionHandler: ^(ATTrackingManagerAuthorizationStatus status) {
       
    }];
/// [NSClassFromString(class) respondsToSelector:NSSelectorFromString(sel)]	 i get true

is this a bug? i want get the right status.

2. when i update iOS 14 beta3 , i found in Setting-Privacy-Tracking there have the equipment master switch on the top.This is off default. but when this off, i call [[ATTrackingManager requestTrackingAuthorizationWithCompletionHandler: ] i got deny status , i dont found a api for the equipment master switch status, can we have a new Api for developer to
confirm the equipment master switch in Setting-Privacy-Tracking?