No, you can include a 1-year degree as well if the other degree is a 3 year or longer course.
Read this ->
https://www.canada.ca/en/immigratio...s-entry/documents/education-assessed/who.html
However, if you have a master's degree, you just need to get that evaluated since you will get 126 points for a Master's degree at the university level. Even if it's one year.. it just has to be evaluated as a Master's degree.
You can check that here ->
https://www.canada.ca/en/immigratio...documents/education-assessed/read-report.html
Search for CRS and then Master's, and you'll see that a 1-year Master's degree is perfectly fine. In fact, I have a 1-year MBA that was evaluated as a Master's degree and I got 126 points.
Alternatively, if for some reason your M.Sc is not recognized as a Master's, you can submit it for 2 or more degrees since your B.Sc is recognized as a 3-year degree. You will only get 119 points, not 126.
Get your degrees evaluated first. Are you certain that your M.Sc will not be recognized as a Master's?