This issue happens not only when deleting a sentence, but also while removing an empty line in the middle or bottom of the page. Same bug also goes to plaintext editing :(
ymteo98
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Taiwan