I have the same question for Message+ app on Google Pixel. Disabling "Smart Emojis" apparently used to prevent this behavior, but a recent update of Message+ app seems to have broken the ability to stop this extremely annoying feature in Message+
We want to make sure you enjoy all the features of your messaging application. Let's gather a few clues to find a solution. Does this only happen when you are in the messaging application? Does this happen on certain words or spelling issues? Please provide as many details as possible.
We certainly understand how it can be bothersome to have highlighted words and phrases when using your Message + Application. Does this only happen when you are in the Message + Application or do you have this issue using other text messaging apps? Could you share more details of what exactly is highlighted?MonicaG_VZW