When editing an article post description, the cursor moves to the end of the section you are trying to make changes to and the text reverts back to the original text.
Highlighting the text and typing over it should result in the highlighted text being replaced by the new text. Instead, it results in the previous text being repopulated.
Developers released a fix for this issue on November 8th. This issue has now been moved to the Completed Issues Tracker. (Issue ID: PUB-657)