Log:
```
Error: Cannot serialize transclusion without data-mw.parts or data-parsoid.src.
at Object.handle (/srv/deployment/parsoid/deploy/src/lib/html2wt/DOMHandlers.js:1345:13)
at /srv/deployment/parsoid/deploy/node_modules/prfun/lib/index.js:532:26
at tryCatch2 (/srv/deployment/parsoid/deploy/node_modules/babybird/lib/promise.js:48:12)
at PrFunPromise.Promise (/srv/deployment/parsoid/deploy/node_modules/babybird/lib/promise.js:458:15)
at new PrFunPromise (/srv/deployment/parsoid/deploy/node_modules/prfun/lib/index.js:57:21)
at /srv/deployment/parsoid/deploy/node_modules/prfun/lib/index.js:530:18
at tryCatch1 (/srv/deployment/parsoid/deploy/node_modules/babybird/lib/promise.js:40:12)
at promiseReactionJob (/srv/deployment/parsoid/deploy/node_modules/babybird/lib/promise.js:269:19)
at PromiseReactionJobTask.call (/srv/deployment/parsoid/deploy/node_modules/babybird/lib/promise.js:284:3)
at flush (/srv/deployment/parsoid/deploy/node_modules/babybird/node_modules/asap/raw.js:50:29)
at process._tickCallback (node.js:415:13)
```
Also at: https://logstash.wikimedia.org/#/dashboard/temp/AVPSWxKHO3D718AOb5xH
Need to check if Content Translation is causing this, as user reported issue at, https://www.mediawiki.org/w/index.php?title=Topic:T0vj02va30kdelc2&topic_showPostId=t19ztek29e9f0aw4#flow-post-t19ztek29e9f0aw4