Hi. We've decided to apply a tag named MassRollback (ja:Special:Tags) to rollback edits done by ja:MediaWiki:Gadget-MassRollback.js. However, the tag isn't applied even when I specify the tags parameter on action=rollback.

• source code (see line 177)
• Diff

I tried the same thing on testwiki with a local tag named testedit, but the result didn't change. On the other hand, the tag was applied without a problem on action=edit and action=delete. Is this a bug of the Action API, or is it just impossible to apply tags programmatically on rollback? (If the latter is the case, I guess the doc has a problem.)
Any help would be appreciated.