The issue described in first post plus some other issues has been fixed in this commit:
https://github.com/discourse/discourse/commit/d9ca6c3bb90c15d32b3f2ece1709522be65fb690
Thanks for the suggestions here @rrit! 
This is happening because the first post is not included from second page onwards in crawler view. @sam should we include first post on all the pages in crawler view to fix the schema issues? 