Call to deprecated method stopPropagation and isPropagationStopped

The composer error is about search_api_autocomplete. Not sure why it is like that?

https://www.drupal.org/pift-ci-job/2673520 →

I’m pretty sure this would break for earlier Drupal versions, but let’s see what the test bot has to say.

Testing of MRs/forks doesn’t work in this project, so you shouldn’t use them, as noted in the info box when creating an issue. See #3190024: Problem with test dependencies when testing issue forks → .

Test fail is from 🐛 Fix failing tests against Drupal 10.1 HEAD Fixed , and therefore unrelated.

I now located the change record → , but it doesn’t say anything about switching to the new Symfony class. Instead, we are supposed to use the \Drupal\Component\EventDispatcher\Event class which already takes care of switching from the old to the new Symfony event class for us.
The deprecation error you describe will probably only occur with Drupal 9 and updated Symfony dependencies. I, for one, cannot reproduce it.

If you are certain that this is a bug that needs to be fixed, please either provide documentation that proves this or steps to reproduce with the latest Drupal version.