Message Board Original thread author and quoted text are appearing all as quoted

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X
• Fix Version/s: 7.0.0 DXP FP51, 7.0.0 DXP SP9, 7.0.X
• Component/s: Frontend Infrastructure
• Labels:
  • ee-7.0.x-only
  • ee-ts
  • liferay-dxp-70-sp9
  • liferay-fixpack-de-51-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay/liferay-portal-ee/pull/8057

Reproduction steps:
1) Start DXP and login as an admin
2) Add a Message Boards portlet on the Welcome page
3) Post a new thread with text "My thread text" and publish it
4) On the 3 vertical dots of the right side of the thread, select "Reply with quote"
5) The initial thread with the author first and last name at the top will be quoted. Right below it, place the cursor in the text editor's blank body 
6) Type any text and publish

Actual behavior: Overall, the text will be:

"Test TestMy thread text"
My answer

Expected behavior: The text to be:

Test Test:
"My thread text"
My answer