Hello,
The 1.36.0-wmf.36 version of MediaWiki is blocked. Immediately after pushing it to group 1 wikis, it encountered three blockers:
* Class 'GlobalUsageHooks' not found https://phabricator.wikimedia.org/T278375
* Constructing RevisionRecord for a page that can't exist: Special:MyLanguage/Main Page [Called from MediaWiki\Revision\MutableRevisionRecord::__construct] https://phabricator.wikimedia.org/T278376
* Argument 1 passed to ProofreadPage\Index\IndexTemplateStyles::__construct() must be a Title, null given. https://phabricator.wikimedia.org/T278379
The later had the most log entries and apparently prevents page from being submitted on wikisources wiki.
Once these issues are resolved the train can resume and we can try pushing to group 1 wikis again.
1.36.0-wmf.36 general task: https://phabricator.wikimedia.org/T274940
Thank you for your assistance.