Change 520376 had a related patch set uploaded (by Tchanders; owner: Tchanders):
[mediawiki/core@master] Fix API message maps for block errors

https://gerrit.wikimedia.org/r/520376

Change 520376 merged by jenkins-bot:
[mediawiki/core@master] Fix API message maps for block errors

https://gerrit.wikimedia.org/r/520376

Actual:

• You are allowed to progress to the editor. If you attempt to save an edit, you will see a generic error, with no block details

I don't see this, apart from the circumstances I describe in T227168#5308317.

Comparing en.m.wikipedia.beta.wmflabs.org to test.m.wikipedia.org.

Test:

{"error":{"code":"blockedtext-composite","info":"Your username or IP address has been blocked. The reason given is: :There are multiple blocks against your account and/or IP address. * Start of block: 12:31, 5 July 2019 * Expiration of longest block: 14:31, 5 July 2019 Your current IP address is 2001:8b0:7acf:5d4e:22cf:30ff:fe4e:1d46. Please include all above details in any queries you make.","docref":"See https://test.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes."},"servedby":"mw1317"}

Beta:

{"error":{"code":"blocked","info":"You have been blocked from editing.","blockinfo":{"blockid":null,"blockedby":"MediaWiki default","blockedbyid":12508,"blockreason":"There are multiple blocks against your account and/or IP address","blockedtimestamp":"2019-07-05T12:21:24Z","blockexpiry":"2019-07-05T15:21:14Z","blockpartial":true},"docref":"See https://en.wikipedia.beta.wmflabs.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes."},"servedby":"deployment-mediawiki-09"}

I am assuming the latter is better than the former, because it may be easier to parse the json.

@dom_walden Just to clarify - the beta has the generic message in your screenshot above - shouldn't it be the other way around? Beta should be running the more recent code.

In T227167#5326927, @Niharika wrote:

@dom_walden Just to clarify - the beta has the generic message in your screenshot above - shouldn't it be the other way around? Beta should be running the more recent code.

Beta does now have a generic error message (in the UI).

I had assumed that was intentional. I am guessing the MobileFrontend just prints the value of the "info" key of the API response, which no longer includes all the information of the block.

Now that you point this out it seems less satisfactory. MobileFrontend might need to be updated to print a more useful block message to the user. Would you like me to raise a bug? I think this is one of a couple of circumstances where the mobile block error is not very helpful (indeed, bugs may already exist, e.g. T189717). Thanks for pointing this out.