It’s possible that your examiners would ask about changes to your research. Not what you could, would or might do to make things “better”, simply given your experience, what would you change?
It’s not a trick or a trap. The question is another way of exploring “what have you learned from the process of doing research?” They’re asking you to demonstrate how far you’ve come, not to showcase what is wrong with your work.
Reflecting on changes could be helpful in your preparation. It can help to make you more certain of what you did. You can be more confident of what you have learned. And before you meet your examiners in the viva it can help you to realise just how far you have come.