https://www.canada.ca/en/immigration-refugees-citizenship/services/application/application-forms-guides/guide-0002-application-canadian-citizenship-under-subsection-5-1-adults-18-years-older.html
Tell us if you have held passports or travel documents during your five (5) year eligibility...
Unfortunately this is what has been observed recently.. That's is the top reason for an application to return.. Submitting acedemic ielts instead of general.
Filling taxes is based on residency, number of days is one of many factors which determines the tax obligations, some other factors are health insurance, children benefits etc. Would suggest you to speak to CRA or your accountant.