Trying to use the "send your mentor a message" feature in GrowthExperiments in beta enwiki with a mentor who has Flow enabled will result in
[XZxgKawQBGoAADFLMe8AAAAK] Exception caught: Request to parsoid for "wikitext" to "html" conversion of content connected to title "Topic:V8sduvnryfx84w40" failed: (curl error: 28) Timeout was reached Flow\Exception\NoParserException at /srv/mediawiki/php-master/extensions/Flow/includes/Conversion/Utils.php(174) #0 /srv/mediawiki/php-master/extensions/Flow/includes/Conversion/Utils.php(66): Flow\Conversion\Utils::parsoid(string, string, string, Title) #1 /srv/mediawiki/php-master/extensions/Flow/includes/Model/AbstractRevision.php(572): Flow\Conversion\Utils::convert(string, string, string, Title) #2 /srv/mediawiki/php-master/extensions/Flow/includes/Model/PostRevision.php(182): Flow\Model\AbstractRevision->setContent(string, string, Title) #3 /srv/mediawiki/php-master/extensions/Flow/includes/Block/TopicListBlock.php(139): Flow\Model\PostRevision->reply(Flow\Model\Workflow, User, string, string) #4 /srv/mediawiki/php-master/extensions/Flow/includes/Block/TopicListBlock.php(100): Flow\Block\TopicListBlock->create() #5 /srv/mediawiki/php-master/extensions/Flow/includes/Block/Block.php(213): Flow\Block\TopicListBlock->validate() #6 /srv/mediawiki/php-master/extensions/Flow/includes/SubmissionHandler.php(120): Flow\Block\AbstractBlock->onSubmit(array) #7 /srv/mediawiki/php-master/extensions/Flow/includes/WorkflowLoader.php(62): Flow\SubmissionHandler->handleSubmit(Flow\Model\Workflow, DerivativeContext, array, string, array) #8 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/HelpPanel/QuestionPoster.php(207): Flow\WorkflowLoader->handleSubmit(DerivativeContext, string, array) #9 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/HelpPanel/QuestionPoster.php(137): GrowthExperiments\HelpPanel\QuestionPoster->submitStructuredDiscussions() #10 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/Api/ApiHelpPanelPostQuestion.php(62): GrowthExperiments\HelpPanel\QuestionPoster->submit() #11 /srv/mediawiki/php-master/includes/api/ApiMain.php(1588): GrowthExperiments\Api\ApiHelpPanelPostQuestion->execute() #12 /srv/mediawiki/php-master/includes/api/ApiMain.php(537): ApiMain->executeAction()↵#13 /srv/mediawiki/php-master/includes/api/ApiMain.php(508): ApiMain->executeActionWithErrorHandling() #14 /srv/mediawiki/php-master/api.php(83): ApiMain->execute() #15 /srv/mediawiki/w/api.php(3): require(string) #16 {main}
Since it's a timeout, maybe it's just beta being slow; it seems deterministic though.