500 on publish is not handled

I’d expect this to trigger a rollback of the transaction, and result in a 4xx response instead of letting the exception go unhandled (and hence the 500).

Thoughts, @tedbow?

I was able to replicate that yesterday while working on 🐛 User is able to create pages with same URL alias Active . I think the transaction doesn't start, but there is no JsonResponse with the error/exception returned, and the "2 Errors" with a dropdown appeared, but without message.

I think that this line: https://git.drupalcode.org/project/experience_builder/-/merge_requests/1... from 🐛 User is able to create pages with same URL alias Active will report correctly all those 500 errors to the client because in this other line: https://git.drupalcode.org/project/experience_builder/-/merge_requests/1..., there is catching the violations and returning a proper JsonResponse.

Imho, we could postpone this issue, or include this issue into 🐛 User is able to create pages with same URL alias Active scope.