I couldn’t figure out why my RTE (rich text editor) wasn’t saved properly until I looked closer. It’s the weird code ‘<o:p></o:p>’ which turned out to be Microsoft’s side. This happened when you copy and paste the texts from Microsoft Words or Outlook. This is coming from web editors’ issues.
Is it something that you can omit in the next patch? See screenshot attach when trying to save the RTE. Thank you!
Source: https://stackoverflow.com/questions/7808968/what-do-op-elements-do-anyway