@FarzHa by the way, I also applied for a work permit extension under the SUV program.
I had to apply for a new LMIA exemption and also paid (again) the employer compliance fee.
And my work permit extension was approved. I actually request a 2year extension and in my letter of explanation, I reasoned that processing times of SUV PR applications was long - so I requested that I be granted a 2 year extension instead of 1 year. And it was granted to me.
For people who haven't yet applied for a WP, it might be worth asking for a 2 year work permit instead of one so that you can avoid having to apply for an extension.