Change #1192891 had a related patch set uploaded (by Urbanecm; author: Urbanecm):

[mediawiki/extensions/CommunityConfiguration@master] Move sorting values into DataProvider

https://gerrit.wikimedia.org/r/1192891

Change #1192891 merged by jenkins-bot:

[mediawiki/extensions/CommunityConfiguration@master] Move sorting values into DataProvider

https://gerrit.wikimedia.org/r/1192891

Status: ⬜ Not QA Testable
Rationale: Backend/config storage issue (objects vs arrays) not visible in UI interactions.

In T406145#11253044, @Edtadros wrote:

Status: ⬜ Not QA Testable
Rationale: Backend/config storage issue (objects vs arrays) not visible in UI interactions.

This should be testable with admin permissions, as the storage is on-wiki (MediaWiki:BlockedExternalDomains.json, specifically). For example, as of writing, MediaWiki:BlockedExternalDomains.json@cswiki looks like this (permalink):

{
	"0": {
		"domain": "atchina.com.cn",
		"notes": "[[.dm.bat]] a jiné od jakéhosi čínského automatu (importováno z [[Special:PermaLink/22560138|MediaWiki:Spam-blacklist]])"
	},
	"1": {
		"domain": "caws.cn",
		"notes": "[[.dm.bat]] a jiné od jakéhosi čínského automatu (importováno z [[Special:PermaLink/22560138|MediaWiki:Spam-blacklist]])"
	},
       // ...
}

As you can see, it is an object with a numeric index. If I use Special:CommunityConfiguration/BlockedDomain to save something (for example, I blocked test-domain.example), the format should fix. On cswiki, it doesn't work yet (as it is on wmf.21, and the patch is in wmf.22), but it should once the train rolls forward.

I think we should test that:

• the blocked domain logic works both when there is an array (expected storage format) and when there's an object (unexpected format, but present on some of the wikis due to this bug),
• that any update via Special:CommunityConfiguration/BlockedDomain fixes the format to the expected one

I'm not sure if you need any extra permissions for this – if needed, I'm happy to assign adminship on test.wikipedia.org and/or beta wikis.

The second of those bullets appears to be validated in production based on https://en.wikipedia.org/w/index.php?title=MediaWiki:BlockedExternalDomains.json&diff=prev&oldid=1316015275 occurring.

\o/

Thanks for the fix! I’m not sure if I would’ve ever guessed this was the cause.

This appears fixed and can be closed