Based on emails we have recieved from you all, we were able to figure out that issue was either not reproducible or that the feature was not being used correctly.
Closing this issue was for now. Let us know in case you encounter the issue again
An error occurred while saving the commentKellyB commented
Here might be something to try! I had the problem where spellcheck was highlighting EVERY word in a text box. I noticed in spellcheck the language was set to Italian. To fix the issue, I couldn't just switch the dictionary in spellcheck to English, I had to highlight all of the text and in the Character panel select English USA as the language at the bottom.