Adjusting report depth for handled errors has no effect

[paulz]

Description

Adjusting report depth as per documentation:
https://docs.bugsnag.com/platforms/ios-objc/reporting-handled-exceptions/#depth
has no effect

Issue

Incrementing number of stack traces to discard

void logError(NSError *error) {
    [Bugsnag notifyError:error block:^(BugsnagCrashReport *report) {
        // Increment the number of stackframes to discard
        report.depth -= 1;
    }];
}

does not cause them being discarded

Environment

Library versions:

• Bugsnag version (from your Podfile, Podfile.lock, or elsewhere): 5.17.3
• CocoaPods version (if any) (pod -v): 1.6.1
• Carthage version (if any):
• iOS/tvOS/macOS version(s) iOS 12
• debug mode or production?: debug
• How are you initializing Bugsnag? Can you share a snippet of your
  AppDelegate where Bugsnag is configured? as per Example app

Error messages:

bugsnag-example/ViewController.swift:58:17logError	
bugsnag-example/ViewController.swift:70:13sendAnError	
<compiler-generated>sendAnError