Authorized period of staySigh. The work permit remains valid. Here is immigration law:
https://laws-lois.justice.gc.ca/eng/regulations/sor-2002-227/page-38.html#docCont
Authorized period ends
(4) The period authorized for a temporary resident’s stay ends on the earliest of
- (a) the day on which the temporary resident leaves Canada without obtaining prior authorization to re-enter Canada;
- (b) the day on which their permit becomes invalid, in the case of a temporary resident who has been issued either a work permit or a study permit;
- (b.1) the day on which the second of their permits becomes invalid, in the case of a temporary resident who has been issued a work permit and a study permit;
- (c) the day on which any temporary resident permit issued to the temporary resident is no longer valid under section 63;
- (c.1) in the case of a person who is required by section 10.01 of the Act to provide their biometric information, the day on which the period of 10 years following the latest day on which the person provided their biometric information under section 10.01 of the Act ends; or
- (d) the day on which the period authorized under subsection (2) ends, if paragraphs (a) to (c) do not apply.
(2) Subject to subsections (3) to (5), the period authorized for the stay of a temporary resident is six months or any other period that is fixed by an officer on the basis of
- (a) the temporary resident’s means of support in Canada;
- (b) the period for which the temporary resident applies to stay; and
- (c) the expiry of the temporary resident’s passport or other travel document.