Ajax POST forms without destination throw BrokenPostRequestException

Thanks for reporting. Sounds like something that may need test coverage, 60/40 on that. Since it's a small change but is marked major.

sahana _n → made their first commit to this issue’s fork.

Hi,

I tried to reproduce the issue in Drupal 11. x and successfully the issue is reproduced.

Reproducing steps
1. Install Drupal Core 11.x
2. Created the custom form with the file element.
3. On submission called Ajax callback.

I created an MR please review it.
If there are any inaccuracies, I would greatly appreciate your suggestions for improvement.
Thanks!!

Previously tagged for tests which still appear to be needed

Also MR appears to be the same as the patch, was there any change?

I have test this issue with the latest merge request. Its working fine as per expectation.
Also attach screenshot.