Yes, you surely can apply for extension in such scenario as IRCC clearly mentioned that. Below is the direct reference.

 

My pro tips:

Please be mindful of the fact that the Govt fee for PGWP extension application will be $155 (please check the fee list of IRCC before you apply as this is always subject to change.). Also, it will cost you extra time, energy, and a little bit of stress as a bonus. Therefore, it’s always better to ensure the passport is valid throughout the expected PGWP tenure during your first-time application for PGWP.

Good Luck!

Other helpful articles related to PGWP:

Can I combine two programs for PGWP application in Canada? Yes / No.

Can I study outside of Canada online while I am on PGWP / Work permit?

I am on PGWP but I am not working or lost my job. Can my spouse apply for an Open Work Permit?

 

Disclaimer: The above writing is not intended to be a source of legal advice. Please seek legal advice and use your own good judgement before choosing to act on any information provided above. If you choose to rely on this article, you do so entirely at your own risk.