One thing I noticed when playtesting the final build of the Quiz Master project (Section 4) of the Unity Game Developer 2D course is that we never change the default Score text from “Score: 100%”. This is relatively innocent as answering questions forces the text to change, however, if you let the timer expire on each quiz question the text remains at 100% until the final screen shows the correct 0%.
Defaulting the score text to 0% seems to be the simplest solution.
Thanks for the course!