Change 636414 had a related patch set uploaded (by Urbanecm; owner: Urbanecm):
[mediawiki/extensions/GrowthExperiments@master] Do not fail with a generic erorr message "Something went wrong" when aborted with a non-good status

https://gerrit.wikimedia.org/r/636414

Change 636414 merged by jenkins-bot:
[mediawiki/extensions/GrowthExperiments@master] Do not fail with a generic error message "Something went wrong" when aborted with a non-good status

https://gerrit.wikimedia.org/r/636414

This is related to T222204: Homepage: improve error handling for questions that trigger abuse-filter which has a bunch of discussion on how it should be handled, and also a patch which does similar things than the patch here, but also tries to handle the (rather unreasonable) error output from the hook better. Maybe worth reviving?

Also, I'm a bit skeptical about these messages being usable - on many wikis they just tend to be really verbose and not written with custom dialogs in mind. (E.g. here's enwiki's version of the email warning mentioned in T266384: Users sharing emails addresses when asking questions using the Newcomers homepage.) That's not something that's easy (or even moderately hard) to fix, I filed T266907: AbuseFilter should provide error/warning messages in an API-friendly plaintext format so there's a task about the issue at least.

I think they're more usable than our current error message, so a definite
improvement. In each case, this should be an edge case.