For the following steps, I have translated article from English to Spanish, with "Use source text" as the default MT option.
- Translate one paragraph with "Use source text" option
- If you make MT abuse warning to show (by translating section header for example) it will display "Your translation contains 100% of unmodified text"
- Make some changes, so that MT usage drops to below 75% and warning disappears
- Save, go back to the dashboard and load the draft again
- The modified section now displays "Your translation contains 100% of unmodified text" again