TTID and TTFD are not measured, due to timing issues

[givip]

Platform

Flutter Mobile

Obfuscation

Disabled

Debug Info

Enabled

Doctor

[✓] Flutter (Channel stable, 3.24.1, on macOS 14.3 23D56 darwin-arm64, locale en-GB)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
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[✓] Network resources

Version

8.8.0

Steps to Reproduce

Sometimes, due to timing issues, the transaction is not registered and consequently not sent to Sentry.

Videos, where repro captured:

Couple initial navigation events registered, but last one not. On screencast, you can see, that there is no message in console.
https://github.com/user-attachments/assets/e8b84e11-7ecb-4dea-8215-9130078469cf
https://github.com/user-attachments/assets/9888c394-f59e-4bf5-9e6f-1fc98d382e36

Minimal code, where I was able to reproduce the issue: https://github.com/givip/sentry_repro

This happens because sometimes method completeTracking() was called earlier than trackRegularRouteTTD()

Expected Result

All transactions should be registered

Actual Result

Sometimes, the transaction is not registered and consequently not sent to Sentry.

Are you willing to submit a PR?

No

[buenaflor]

hey! thanks for raising this, we'll have a look

[buenaflor]

Could you reproduce the same without using SentryDisplayWidget?

[buenaflor]

but yes I was able to reproduce it using SentryDisplayWidget:

I/flutter (10200): stop ttid tracking
I/flutter (10200): start ttid tracking

For now I'd suggest not using SentryDisplayWidget until we've fixed this problem

[denrase]

@givip Can you also reproduce it if you provide Sentry with the appRunner?

void main() async {
  await SentryFlutter.init(
    (options) {
        ...
    },
    appRunner: () => runApp(
        SentryDisplayWidget(
          child: const MyApp(),
        )
    ),
  );
}